Docstoc

CONTACT LENSES

Document Sample
CONTACT LENSES Powered By Docstoc
					428 EYESITE EXPLORER front sect   8/6/04   5:49 PM   Page 14




           T E C H N I C A L


                                  http://www.eyesite.co.za/explorer




                      CONTACT LENSES




      412
428 EYESITE EXPLORER front sect                     8/6/04   5:46 PM   Page 14




           T E C H N I C A L


                                                   http://www.eyesite.co.za/explorer




                                                  CONTACT LENSES
                  JOHNSON & JOHNSON VISION CARE




      414
428 EYESITE EXPLORER front sect   8/6/04   11:08 AM   Page 16




           T E C H N I C A L


                                  http://www.eyesite.co.za/explorer




                      CONTACT LENSES




      416
428 EYESITE EXPLORER front sect   8/6/04   11:08 AM   Page 17




                                                                                          T E C H N I C A L


                                                      http://www.eyesite.co.za/explorer




                CONTACT LENSES




                                                                                                              417
                                                                                                                                                                                                                                                     428 EYESITE EXPLORER front sect
418




                                                                                                                                                                                                                                 T E C H N I C A L
          CIBA VISION
          CIBA VISION
      PRODUCT NAME                                       BASE          DIA    REFRACTIVE POWER RANGE                                             WEARING SCHEDULE




                                                                                                                                                                            CONTACT LENSES
      PRODUCT NAME                                       BASE         DIA    REFRACTIVE POWER RANGE                                              WEARING SCHEDULE
                                                         CURVES
                                                         CURVE
                                                         S
                                                                          DISPOSABLE CONTACT LENSES




                                                                                                                                                                                             http://www.eyesite.co.za/explorer
      SPHERICAL CONTACT LENSES




                                                                                                                                                                                                                                                     8/6/04
      Frequent Replacement Soft Contact Lenses (clear)
      FOCUS® Monthly Visitint® - 6 pack, 55% Water       8.60     14.00                                                                          Daily wear & monthly
      Content                                            8.90                +6.00 t0 - 8.00 (0.25 steps), - 8.00 t0 -15.00 (0.50 steps)         replacement




                                                                                                                                                                                                                                                     11:08 AM
                                                         8.40     14.40      +8.00 t0 - 10.00 +10.00 to –16.00, (above +5.00 and –6.00 in 0.50   Daily wear & monthly
      Precision UV – 6 pack, 74% Water Content           8.70                steps)                                                              replacement
      Daily Disposable Contact Lenses (clear)
      FOCUS® Dailies® - 30 pack, 69% Water               8.60     13.80      +6.00 t0 +0.50 (0.25 step, -0.50.t0 -6.00(0.25 steps)               Daily wear & replacement
      Content




                                                                                                                                                                                                                                                     Page 18
                                                    8.60       13.80         -6.50 to –10.00 (0.50 steps)   Same as the 30 pack                  Daily wear & replacement
      FOCUS® Dailies® - 90 pack, 69% Water
      Content
      Frequent Replacement Extended Wear Soft Contact Lenses (clear)
      FOCUS® 1-2 Week Visitint® - 6 pack (New            8.40     14.00                                                                          2 Week daily wear or 7
      Vues)                                              8.80                +4.00 t0 - 6.00 (0.25 steps, - 6.00 t0 -10.00 (0.50 steps)          days extended wear
      55% Water Content
                                                         8.40     13.80      +6.00 t0 - 8.00 (0.25 steps), -8.50 to -10.00 (0.50 steps)          30 Nights extended wear
      FOCUS® NIGHT & DAY™ - 6 pack, 24% Water            8.60                                                                                    & monthly replacement
      Content
      Dk/t 175                                           "        "

      FOCUS® NIGHT & DAY™ -Trials
      Frequent Replacement Cosmetic Soft Contact Lenses (clear)
      FOCUS® 1-2 Monthly Soft Colors® - 6 pack           8.40     14.00      +6.00 t0 - 8.00 (0.25 steps)                                        Daily wear & monthly
      55% Water Content                                  8.90                                                                                    replacement
      Royal Blue, Aqua, Evergreen
                                                         8.60     14.50      +6.00 t0 - 8.00 (0.25 steps)                                        Occasional wear /daily
      FreshLook Color - 2 pack - 55% Water Content                                                                                               wear & monthly
      Blue, Green, Hazel, Violet,                                                                                                                replacement
      Sapphire blue, Misty Gray
                                                                                                                                                                                                                                                    428 EYESITE EXPLORER front sect
         CIBA VISION
      SPHERICAL CONTACT LENSES




                                                                                                                                                                                                                                                    8/6/04
      Frequent Replacement Cosmetic Soft Contact Lenses
      FreshLook ColorBlends – 2 pack , 55% Water     8.60     14.50   +6.00 t0 –8.00 (0.25 steps)                                                   Occasional wear/




                                                                                                                                                                           CONTACT LENSES
      Content                                                                                                                                       Daily wear & monthly
      Blue, Green, Brown, Gray,                                                                                                                     replacement




                                                                                                                                                                                                                                                    11:08 AM
      Turquoise, Honey, Amethyst
                                                     8.60     14.50   +6.00 t0 –8.00 (0.25 steps)                                                   Occasional wear/
      FreshLook ColorBlends – 6 pack , 55% Water                                                                                                    Daily wear & monthly
      Content                                                                                                                                       replacement
      Blue, Green, Brown, Gray,
      Turquoise, Honey, Amethyst




                                                                                                                                                                                            http://www.eyesite.co.za/explorer




                                                                                                                                                                                                                                                    Page 19
                                                                                                                                                    Occasional wear/
      FreshLook Radiance – 2 pack , 55% Water         8.60    14.50   +6.00 t0 –8.00 (0.25 steps)                                                   Daily wear & monthly
      Content                                                                                                                                       replacement
      Sunrise (Gold), Eden (Green),
      Autumn (Bronze), Moonlight (Silver)

      TORIC CONTACT LENSES
      Frequent Replacement Toric Soft Contact Lenses
      FOCUS® Monthly Toric VVisitint ® – 6 pack      8.90     14.50   Sph. +4.00 to -6.00/, Cyl. – 1.00, - 1.75, -2.50 (Cyl. – 2.50 only Plano to   Daily wear & monthly
      55% Water Content                                               -6.00).                                                                       replacement
                                                                      Axis 10° 20° 70° 80° 90° 100° 110° 160° 170° 180°
      FOCUS® Dailies® Toric – 30 pack                 8.60    14.20                                                                                 Daily wear &
      69% Water Content                                               Sph. -0.50 to -6.00 in 0.25 steps. Cyl. -0.75 Axis 180° and 90°               replacement
      MULTIFOCAL CONTACT LENSES

      Frequent Replacement Multifocal Soft Contact Lenses
      FOCUS® Progressives® - 6 pack                    8.60   14.00   +6.00 to -7.00 (0.25 steps)                                                   Daily wear & monthly
      55% Water Content                                8.90                                                                                         replacements

      FOCUS® Progressives® Trials                     "       "       "
                                                                                                                                                    Daily wear &
      FOCUS® Dailies® Progressives® - 30 pack         8.60    13.80   +5.00 to -6.00 (0.25 steps)                                                   replacement
      69% Water Content




                                                                                                                                                                                                                                T E C H N I C A L
419
                                                                                                                                                                                                                               428 EYESITE EXPLORER front sect
420




                                                                                                                                                                                                           T E C H N I C A L
      CIBA VISION




                                                                                                                                                      CONTACT LENSES
      PRODUCT NAME                                                               BASE                  REFRACTIVE POWER              WEARING
                                                                                 CURVES        DIA     RANGE                         SCHEDULE

                                                                     FITTING SETS - COSMETIC




                                                                                                                                                                       http://www.eyesite.co.za/explorer
      Durasoft 3 Colors – Fit Set (9 Lenses)                                      8.60         14.50   Plano




                                                                                                                                                                                                                               8/6/04
      55% Water Content.
      Baby Blue, Chestnut Brown, Hazel, Misty Gray, Emerald Green, Sapphire Blue,
      Aqua, Jade Green, Violet.
                                                                                  8.60         14.50   Plano
      Durasoft 2 ColorBlends – Fit Set (4 lenses)




                                                                                                                                                                                                                               11:08 AM
      38% Water Content
      Blue, Brown, Gray, Green.

                                                               FITTING SETS – COSMETIC DISPOSABLE
      FreshLook Colors – Fit Set (6 Lenses)                                       8.60        14.50    Plano




                                                                                                                                                                                                                               Page 20
      55% Water Content.
      Blue, Green, Hazel, Violet, Sapphire Blue, Misty Gray.

      FreshLook ColorBlends – Fit Set (7 Lenses)                                 8.60          14.50   Plano
      55% Water Content
      Blue, Green, Brown, Gray, Turquoise, Honey, Amethyst.

      FreshLook RADIANCE – Fit Set (4 Lenses)
      55% Water Content
      Sunrise, Autumn, Moonlight, Eden.
      SPHERICAL CONTACT LENSES

      Conventional Soft Contact Lenses
      Cibasoft® Visitint® - 38% Water Content                                    8.30          13.80   +6.00 to -6.00 (0.25 steps)   Daily Wear
                                                                                 8.60                   -6.00 to -10.00 (0.50        6-9 Months
                                                                                 8.90                  steps)                        replacement

      Weicon CE – 60% Water Content                                              Steep/flat    13.00
                                                                                               13.80   +25.00 to -6.00 (0.25         Daily Wear
                                                                                               14.60   steps)                        6-12 Months
                                                                                                                                     replacement
      Weicon 38E 38% Water Content                                               Steep/flat    13.00
                                                                                               13.80
                                                                                               14.60   +25.00 to -25.00 (0.25        Daily Wear
                                                                                                       steps)                        12 - 18 Months
                                                                                                                                     replacement
                                                                                                                                                                                                                                                                     428 EYESITE EXPLORER front sect
       CIBA VISION

      Conventional Cosmetic Soft Contact Lenses
      Elegance – 38% Water Content                      8.40         13.80       +1.00 to -6.00 (0.25 steps)                                                      Daily wear, replacement




                                                                                                                                                                                            CONTACT LENSES
      Dark Blue, Light Blue, Light Green, Dark Green,   8.70                                                                                                      annually
      Hazel, Gray.

      Durasoft 3 Colours – 55% Water Content            8.30         14.50       +6.00 to -8.00 (0.25 steps)                                                      Daily wear replacement
      Baby blue, Chestnut, Brown, Hazel, Misty Gray,    8.60                     (BC 9.00: Plano to -4.00 only)                                                   3/6/12 monthly
      Emerald Green, Violet, Sapphire Blue, Aqua,       9.00




                                                                                                                                                                                                                                                                     8/6/04
      Jade Green.
                                                        8.60         14.50       +4.00 to -6.00 (0.25 steps)                                                      Daily wear replacement
      Durasoft 2 ColorBlends 38% Water Content                                                                                                                    3/6/12 monthly
      Blue, Brown, Gray, Green,
                                                        8.60         13.80       +4.00 to -6.00 (0.25 steps)                                                      Daily wear replacement




                                                                                                                                                                                                                                                                     11:08 AM
      Illusions® - 38% Water Content                    8.90                                                                                                      annually
      Violet, Soft Green, Deep Green, Soft Blue,
      Deep Blue, Gray, Soft Amber.

                                                                            CONVENTIONAL CONTACT LENSES
      TORIC CONTACT LENSES




                                                                                                                                                                                                             http://www.eyesite.co.za/explorer




                                                                                                                                                                                                                                                                     Page 21
      Conventional Toric Soft Contact Lenses (Clear)
      DuraSoft 3 Optifit Colors – 55% Water Content     8.10         14.50       Sph +10.00 to -10.00 (0.25 steps)                                                Daily wear replacement
                                                        8.40                     Sph +/- 10.00 to +/- 20.00 (0.50 steps)                                          annually
                                                        8.70                     (Cyl. -0.75 to -9.75 (0.25 steps). Axis 5° ATC
      Conventional Toric Cosmetic Soft Contact Lenses
      DuraSoft 3 Optifit Colors – 55% Water Content   8.10           14.50       Sph +10.00 to -10.00 (0.25 steps)                                                Daily wear replacement
      Baby Blue, Chestnut Brown, Hazel, Misty Gray,   8.40                       Sph +/- 10.00 to +/- 20.00 (0.50 steps)                                          annually
      Aqua, Emerald Green, Violet, Sapphire Blue,     8.70                       (Cyl. -0.75 to -9.75 (0.25 steps). Axis 5° ATC
      Jade Green.

                                                                     SPECIALITY SOFT / HARD CONTACT LENSES
      Soft Perm ®                                       7.10 to       8.00    +4.00 to -8.00 (0.25 steps)                                                         Daily wear replacement
                                                        8.10          (RGP    +4.00 to 6.00 (0.50 steps)                                                          annually
                                                        (0.10         centre) -8.00 to -13.00 (0.50 steps)
                                                        steps)       14.30
                                                                     (Soft
                                                                     skirt)

                                                                              HARD / RGP CONTACT LENSES
      Persecon E                                        6.90 to      8.80        +25.00 to -25.00 (0.25 steps)                                                    18 to 24 months
                                                        8.60 (0.10
                                                        steps)       9.30
                                                        7.00 to




                                                                                                                                                                                                                                                 T E C H N I C A L
                                                        8.70 (0.10   9.80*
                                                        steps)
                                                        7.10 to      10.30*
                                                        8.80 (0.10               *Persecon E lenses with power of >+2.00 D manufactured with a minus-carrier in
                                                        steps)                   these two diameters.
                                                        7.20 to
                                                        8.90 (0.10
                                                        steps)
421
                                                                                                                                                                                                                   428 EYESITE EXPLORER front sect
422




                                                                                                                                                                                               T E C H N I C A L
      CIBA VISION




                                                                                                                                          CONTACT LENSES
      PRODUCT NAME                                      BASE             DIA     REFRACTIVE POWER RANGE          WEARING SCHEDULE
                                                        CURVES




                                                                                                                                                           http://www.eyesite.co.za/explorer
                                                                               HARD / RGP CONTACT LENSES




                                                                                                                                                                                                                   8/6/04
      Persecon 92 E                                     7.20 to 8.50   8.80      +25.00 to -25.00 (0.25 steps)   18 to 24 months
                                                        (0.10 steps)
                                                        7.20 to 8.50   9.30
                                                        (0.10 steps)
                                                        7.30 to 8.50   9.80




                                                                                                                                                                                                                   11:08 AM
                                                        (0.10 steps)
                                                        7.40 to 8.60   10.30
                                                        (0.10 steps)

      Persecon E Keratoconus                            5.90 to 7.60   9.30      +25.00 to -25.00 (0.25 steps)   Daily wear replacement
                                                        (0.10 steps)                                             annually




                                                                                                                                                                                                                   Page 22
                                                        6.00 to 7.70   9.80
                                                        (1.10 steps)

                                                                                  FITTING SETS (CLEAR)
      Focus® Night & Day™ - Fit Set 34 lenses, 2 of     8.60           13.80     -0.75 to -4.75 (0.25 steps)
      each power
                                                        8.60           14.00     +6.00 to -7.00 (0.25 steps)
      Focus® Progressives® - Fit set 106 Lenses, 2 of   8.90
      each power
                                                                                 -3.00
                                                        7.10 to 8.10   14.30
      Soft Perm® - Fit set 11 lenses                    (0.1mm
                                                        steps)

                                                                                FITTING SETS - COSMETIC
      Elegance – Fit Set 6 lenses – 38% Water           8.70           13.80     Plano
      Content
      Light Blue, Light Green, Dark Green, Hazel,
      gray.                                             8.60           13.80     Plano

      Illusions® - Fit Set 7 lenses – 38% Water
      Content
      Violet, Soft Green, Gray, Soft Blue, Deep
      Green, Deep Blue, Soft Amber.
                                                                                                                                                                                                                      428 EYESITE EXPLORER front sect
                                                                                                                                             CONTACT LENSES


                                                                                                                                                                                                                      8/6/04
             SOFLEX

      DISPOSABLE LENSES IN BLISTERS




                                                                                                                                                                                                                      6:29 PM
      LENS BRAND NAME       MATERIAL            PACK          BASE CURVES         POWERS             DIAMETER   WATER     CENTRE THICKNESS
                                                                                                                CONTENT   at –3.00 DS
      Dispo®                    Methafilcon A   3,6-Pack      8.6                 -0.25 to –10.00
                                                              8.8                 +0.25 to +8.00     14.2       55%       0.08
                                                              8.9                  -0.25 to –8.00




                                                                                                                                                                                                                      Page 15
                                                                                                                                                              http://www.eyesite.co.za/explorer
      Dispo Aspheric®      Methafilcon A        3,6-Pack      8.4, 8.7            +8.00 to –10.00    14.4       55%       0.09
      Dispo Toric®         Methafilcon A        3.6-Pack      8.7                 +4.00 to –8.00     14.4       55%
      Dispo Multi          Methafilcon A        6-pack        8.70                +6.00 to –7.00     14.4       55%       0.12
      Dispo Day by Day                          32-Pack       8.60                +6.50 to –6.50     14.3       72%       0.17
      CONVENTIONAL LENSES IN VIALS
      LENS BRAND NAME      MATERIAL             PACK          BASE CURVES         POWERS             DIAMETER   WATER     CENTRE THICKNESS
                                                                                                                CONTENT   at –3.00 DS
      Expo                      GM3 Filcon      Single Vial   8.20, 8.50, 8.80
                                                                                  -20.00 to +10.00   14.0       58%       0.13
                                4a
      CDGM 3                    GM3 Filcon      Single Vial   8.00 to 8.80 in                        13.0
                                4a                            0.02 mm steps       -20.00 to +20.00   13.5       58%       0.20
                                                                                                     14.5
      Toric Lite®               GM3 Filcon      Single Vial   8.4, 8.7, 9.0                          13.5
                                                                                  -10.00 to +10.00              58%
                                4a                            (8.1, 9.3)                             14.5
      Toric Eye-Q® Multifocal   GM3 Filcon      Single Vial   8.4, 8.7, 9.0                          13.5
                                                                                  -10.00 to +10.00              58%
                                4a                            (8.1, 9.3)                             14.5
      Soft K. 67                Filcon 11 2     Single Vial   7.30, 7.60, 7.90,
                                                                                  +20.00 to –20.00   14.2       67%       0.36
                                                              8.20
      Lens 55 UV                                Single Vial   8.80                +8.00 to –8.00     14.2       55%       0.09
      Silver                                    Single Vial   8.40, 9.00          -0.25 to –8.00
                                                              8.70                -0.25 to –10.00    14.0       38.5%     0.10
                                                              8.70                +0.25 to +8.00




                                                                                                                                                                                                  T E C H N I C A L
423
                                                                                                                                                                                                                                     428 EYESITE EXPLORER front sect
424




                                                                                                                                                                                                                 T E C H N I C A L
             SOFLEX




                                                                                                                                                            CONTACT LENSES
      LENS BRAND         MATERIAL        PACK       BASE CURVES         POWERS                  DIAMETER   WATER     CENTRE        CYLINDER   AXIS
      NAME                                                                                                 CONTENT   THICKNESS
                                                                                                                     at –3.00 DS
      Dispo®             Methafilcon A   3,6-Pack   8.6                 -0.25 to –10.00




                                                                                                                                                                             http://www.eyesite.co.za/explorer




                                                                                                                                                                                                                                     8/6/04
                                                    8.8                 +0.25 to +8.00          14.2       55%       0.08
                                                    8.9                  -0.25 to –8.00
      Dispo Aspheric®    Methafilcon A   3,6-Pack   8.4, 8.7            +8.00 to –10.00         14.4       55%       0.09
      Dispo Toric®       Methafilcon A   3,6-Pack   8.7                 +4.00 to –8.00                     55%                     -0.75, -   10° TO
                                                                                                                                   1.25       180°




                                                                                                                                                                                                                                     7:41 PM
                                                                                                14.4
                                                                                                                                   -1.75, -   in 10°
                                                                                                                                   2.25       steps
      Dispo Multi        Methafilcon A   6-pack     8.70                +6.00 to –7.00          14.4       55%       0.12
      Dispo Day by Day   Filcon II 2     32-Pack    8.60                +6.50 to –6.50          14.3       72%       0.17
      LENS BRAND         MATERIAL        PACK       BASE CURVES         POWERS                  DIAMETER   WATER     CENTRE        CYLINDER   AXIS




                                                                                                                                                                                                                                     Page 14
      NAME                                                                                                 CONTENT   THICKNESS
                                                                                                                     at –3.00 DS
      Expo               GM3 Filcon      Single     8.20, 8.50, 8.80
                                                                        -20.00 to +10.00        14.0       58%       0.13
                         4a              Vial
      CDGM 3             GM3 Filcon      Single     8.00 to 8.80                                13.0
                         4a              Vial       in 0.02 mm steps    -20.00 to +20.00        13.5       58%       0.20
                                                                                                14.5
      Toric Lite®        GM3 Filcon      Single     8.4, 8.7, 9.0                               13.5                               ANY        1° to 180°
                                                                        -10.00 to +10.00                   58%       0.19
                         4a              Vial       (8.1, 9.3)                                  14.5                                          in1° steps
      Toric Eye-Q®       GM3 Filcon      Single     8.4, 8.7, 9.0                               13.5                               ANY        1° to 180°
      Multifocal         4a              Vial       (8.1, 9.3)          -10.00 to +10.00                   58%       0.19                     in 1° steps
                                                                                                14.5
      Soft K. 67         Filcon II 2     Single     7.30, 7.60, 7.90,
                                                                        +20.00 to –20.00        14.2       67%       0.36
                                         Vial       8.20
      Lens 55 UV         Filcon Ib       Single     8.60                -0.25 to –8.00 (0.25
                                         Vial                           steps)
                                                                        -8.50 to –10.00 (0.50
                                                                        steps)
                                                    8.80                -0.25 to –8.00 (0.25
                                                                                                14.2       55%       0.09
                                                                        steps)
                                                                        +0.25 to +8.00 (0.25
                                                                        steps)
                                                                        -8.50 to -10.00 (0.25
                                                                        steps)
      Silver             Filcon Ia       Single     8.40, 9.00          -0.25 to –8.00
                                         Vial       8.70                -0.25 to –10.00         14.0       38.5%     0.10
                                                    8.70                +0.25 to +8.00
428 EYESITE EXPLORER front sect   8/6/04   6:22 PM   Page 15




                                                                                         T E C H N I C A L


                                                     http://www.eyesite.co.za/explorer




                     LENS MATERIALS




                                                                                                             425
428 EYESITE EXPLORER front sect   8/6/04   11:08 AM   Page 30




           T E C H N I C A L


                                  http://www.eyesite.co.za/explorer




                      PROGRESSIVE LENSES




      426
428 EYESITE EXPLORER front sect   8/6/04   6:07 PM   Page 15




                                                                                         T E C H N I C A L


                                                     http://www.eyesite.co.za/explorer




                     PROGRESSIVE LENSES




                                                                                                             429
428 EYESITE EXPLORER front sect   8/6/04   7:16 PM   Page 14




            T E C H N I C A L


                                  http://www.eyesite.co.za/explorer




                   PROGRESSIVE LENSES




      430
428 EYESITE EXPLORER front sect   8/6/04   6:31 PM   Page 15




                                                                                         T E C H N I C A L


                                                     http://www.eyesite.co.za/explorer




                           PROGRESSIVE LENSES




                                                                                                             431
428 EYESITE EXPLORER front sect   8/6/04   7:29 PM   Page 14




           T E C H N I C A L


                                  http://www.eyesite.co.za/explorer




                   PROGRESSIVE LENSES




     432
428 EYESITE EXPLORER front sect                  8/6/04        7:19 PM        Page 15




                                                                                                                                                        T E C H N I C A L


                                                                               http://www.eyesite.co.za/explorer




                        LOW VISION
           WHO WORKING DEFINITION OF A PERSON WITH LOW VISION
           (adopted in Bangkok in 1992)

           A person with low vision is one who has impairment of visual function even after treatment and/or standard refractive correction and has an acuity of less than 6/18
           (20/60) to light perception or a visual field of less than 10 degrees from the point of fixation, but who uses or is potentially able to use vision for the planning and/or
           execution of a task.

           Legal Blindness

           Legal Blindness defines neither low vision nor functional blindness, but may include individuals from either category. Any individual is considered to be legally blind
           if the best corrected visual acuity in the better eye is less than or equal to 6/60 (20/200) or, if the acuity in that eye is better than 20/200, that the visual field is less
           than or equal to 20 degrees in the widest diameter.
           (Visual field is measured with a 10mm white target on a 1-meter tangent screen or a 3/330 target on a perimeter.)

                                                         APPROXIMATE TABLE OF EQUIVALENT VISUAL ACUITY
                                                                      NOTATION FOR NEAR

                    Meters                    Snellen                     Jaeger                  Point (N)                       Approx                       Usual type
                   Equivalent                Equivalent                                                                           height                        Text size

                       0.4 M                    20/20                                                  3                         0.58mm
                       0.5 M                    20/25                       J1                         4                         0.75mm                         Footnotes
                       0.8 M                    20/40                       J4                         6                          1.15mm                    Paperbook print
                       1.0 M                    20/50                       J6                         8                         1.50mm                     Newspaper print
                       1.2 M                    20/60                       J7                         9                         1.75mm                      Magazine print
                       1.6 M                    20/80                       J9                        12                         2.30mm                     Children’s books
                       2.0 M                   20/100                       J 11                      14                         3.00mm                   Large print material
                       4.0 M                   20/200                       J 17                      28                         6.00mm               Newspaper subheadlines
                       5.0 M                   20/250                       J 18                                                  7.5mm                  Newspaper headlines
                      10.0 M                   20/500                       J 19                                                 15.00mm                     1/2 inch letter
                      20.0 M                   20/1000                      J 21                                                30.00mm                        1 inch letter

           USEFUL FORMULAE

           1. Calculation of magnification needs                                                        3. Rule of thumb for calculation of Near PD when prescribing high
           Magnification ratio       = Present acuity level                                             Adds
                                            Desired acuity level                                        • Decentre each lens in 1mm for each dioptre of Add
                                                                                                        • Give 1 prism base in on EACH eye per dioptre of Add
                                         = letter size can read
                                          letter size wants to read                                     For example:
           Example:                                                                                     For +8.00D Add with distance PD =67mm, give 8 prism diopters base in on
           Patient can read 6/36 and required VA is 6/12.                                               EACH eye (total of 16D)and decentre each eye 8mm ( 67 – 16 =51mm nearPD)
           Magnification = 36 = 3x magnification
                            12                                                                          4. Formula for calculation of Near PD when prescribing high Adds
                                                                                                        • Dioptres of WD (x 1.5) if PD < = 65mm
           2. Calculation of Add using M system at near                                                 • Dioptres of WD (x 1.5) + 1 if PD > 65mm
           ADD = letter size can read X reference add in dioptres
                 letter size wants to read                                                              Example:
                                                                                                        If prescribing +4.00D Add with WD =25cm and patient has Dist PD = 65mm
           Example:                                                                                     To calculate near PD: 4.00 (x 1.5) = 6mm
           Patient reads 1.6M at 20cm and wants to read 0.6M, what add is required?                     NEAR PD = 65 – 6mm = 59mm
           ADD = 1.6 X 5 = 13D, Working Distance = 100 / 13 = 7.7cm
                  0.6




                                                                                                                                                                                             433

				
DOCUMENT INFO
Shared By:
Categories:
Stats:
views:349
posted:1/22/2011
language:English
pages:18