Learning Center
Plans & pricing Sign in
Sign Out

Basic Principles of Contact Lens Fitting Association of astigmatism


Basic Principles of Contact Lens Fitting Association of astigmatism

More Info
									                Association of Technical Personnel in Ophthalmology (ATPO)
                                                COVE Quiz
This quiz is worth 1.5 JCAHPO Group A continuing education credits. To obtain the video, call the
American Academy of Ophthalmology (AAO) at (415) 561-8540 or visit

                    M. Freeman, MD, P. Rakow, COMT, and R. Campbell, MD

   1. The MOST important initial indication for contact lens wearing success is:
      a. spherical refractive error
      b. motivation to wear the lenses
      c. good precorneal tear film
      d. average corneal curvatures
      e. using the right solutions

   2.    One indication to wear soft contact lenses is which of the following?
        a. precise vision
        b. marginally dry eyes
        c. sports involvement
        d. ability to modify the size of the lens
        e. the presence of giant papillary conjunctivitis

   3. Assessing the patient for contact lens wear of any type begins with:
      a. keratometry
      b. lensometry
      c. corneal topography
      d. tear function testing
      e. history taking

   4. Indications for rigid contact lens wear include:
      a. part-time wear
      b. immediate comfort
      c. low visual expectations
      d. concern with the cost of lens maintenance
      e. immediate, all day wear

   5. One reason for failure to successfully wear contacts is:
      a. inadequate tear production
      b. blue eyes
      c. spherical corneas
      d. small pupils
      e. glaucoma

   6. It is important to rinse out fluorescein dye before fitting this type of contact:
      a. PMMA lenses
      b. HEMA lenses
      c. gas-permeable lenses
      d. complicated lens designs
      e. all of the above

   7. The larger the radius of curvature of a contact lens, the:
      a. steeper the lens
      b. flatter the lens
      c. larger the diameter
      d. smaller the diameter
      e. shallower the “vault” of the lens
Basic Principles of Contact Lens Fitting                                                                 2

    8. Your patient has “K” readings of 41.50 D, spherical. You would choose which type of soft contact
       lens to start with:
       a. manufacturer’s flattest base curve
       b. manufacturer’s medium base curve
       c. manufacturer’s steepest base curve
       d. any of the above
       e. none of the above

    9.    “Myopia Creep” means:
         a. the lens “creeps up” with each blink
         b. the lens “creeps down” with each blink
         c. the cornea gets flatter from dehydration
         d. the cornea gets steeper from fluid retention
         e. none of the above

    10. Your patient reports that their vision seems sharpest immediately before they blink each time,
        you might suspect:
        a. the lens needs astigmatic power
        b. a “too flat” base curve
        c. the lens is too small
        d. the lens is too large
        e. a lower water content lens is indicated

    11. To make a lens fit looser on the eye, you would make it:
        a. toric
        b. keratoconic
        c. flatter
        d. more powerful
        e. steeper

    12. Which of the following is a characteristic of an optimum soft contact lens fit?
        a. vision clearest right before each blink
        b. vision clearest right after each blink
        c. baring of the limbus with each blink
        d. lens centration down and out
        e. 1-1.5 mm movement with each blink

    13. “Alignment” fitting is best used:
        a. against the rule astigmatism
        b. with the rule astigmatism
        c. lenticular astigmatism
        d. oblique astigmatism
        e. none of the above

    14. One characteristic of a flat fitting rigid lens is:
        a. “seal-off” at the periphery
        b. decreased tear exchange
        c. excessive movement
        d. apical clearance
        e. central pooling

    15. A myoflange edge helps rigid lenses “pick-up” in which type of refractive condition?
        a. high myopia
        b. hyperopia
        c. with the rule astigmatism
        d. against the rule astigmatism
        e. irregular astigmatism
Basic Principles of Contact Lens Fitting                                                                    3

    16. Which type of lens would be used when the corneal curvature is spherical but there is residual
        a. front toric
        b. back toric
        c. aspheric
        d. lenticular
        e. prism ballasted

    17. The following numbers represent base curves. Which would be the steepest?
        a. 8.30
        b. 7.80
        c. 7.50
        d. 7.10
        e. 6.90

    18. An example of “with the rule” astigmatism, expressed in a keratometer reading, would be which of
        the following?
        a. 43.50 X 090 / 42.00 X 180
        b. 44.00 X 180 / 44.00 X 090
        c. 41.50 X 090 / 43.00 X 180
        d. 45.50 X 075 / 46.25 X 165
        e. 43.75 X 045 / 41.25 X 135

    19. A fluorescein pattern with an absence of dye under the center of the lens indicates a lens that is:
        a. too steep
        b. warped
        c. too flat
        d. clearing apically
        e. back toric on a spherical cornea

    For the following three questions (20, 21, and 22), match the instrument to the feature it is used to
    verify on contact lenses:
         a. thickness gauge
         b. geneva lens clock
         c. lensometer
         d. radiuscope
         e. “V” groove

    20. Front vertex power

    21. Base Curve

    22. Lens diameter
Basic Principles of Contact Lens Fitting                                                                         4

                                            COVE Answer Sheet
This quiz is worth 1.5 JCAHPO Group A continuing education credits. To obtain the video, call
the American Academy of Ophthalmology (AAO) at (415) 561-8540 or visit
You must complete the enclosed quiz on your own and may not seek assistance from other
individuals in completing the quiz. You may, however, seek assistance from other individuals for
clarification and understanding of the article content. Failure to comply with this policy may result
in the revocation of credit.

Name                                                                       JCAHPO Certification

Home Address

City / State / Zip

Home Phone                                               Work Phone

E-mail Address                                  Signature
  ATPO Member – $15.00
  ATPO Member – Complimentary*
  Non-Member – $22.50
  Rush Processing - $10.00
Method of Payment: Check (payable to ATPO) VISA  MasterCard Discover
Credit Card #: __________________________________________________________________________________________
Expiration Date: _________________________ Security (SVC) Code (on back of credit card): ___________________________
Name of Cardholder (please print): __________________________________________________________________________
Cardholder’s billing address: _______________________________________________________________________________
Cardholder’s Signature: __________________________________________________________________________________
Place your answers to each question in the appropriate space adjacent to the question number.

1.                              7.                               13.                               19.
2.                              8.                               14.                               20.
3.                              9.                               15.                               21.
4.                              10.                              16.                               22.
5.                              11.                              17.
6.                              12.                              18.
By filling in the above spaces and signing your name, you agree that:
    • A total of 75% or more correct is a passing score.
    • ATPO is not responsible for Answer Sheets and Evaluation Forms not received at the ATPO offices.
I attest that I have completed this quiz on my own. ___________________________________________________________

  Return completed answer
 sheet, evaluation form, and                       Questions?
         payment, to:                          Visit
            ATPO                               Call (800) 482-4858
        Attn: CE Dept
    2025 Woodlane Drive
     St. Paul, MN 55125
     Fax: (651) 731-0410
Basic Principles of Contact Lens Fitting                                                                 5
                                           COVE Evaluation


Please read each question carefully. Your feedback is important to us. Thank you!

1. How long have you been employed in the field of ophthalmology?                           years

2. This video was designed at a level right for me.     (circle one)       YES     NO

3. Please read the following statements. Then, circle the number corresponding to the degree to which
   you agree with each statement.

                                           Strongly                              Strongly      Not
                Statement                              Agree      Disagree
                                            Agree                                Disagree   Applicable
    a. The material was organized
       and presented in a clear and           5          4             3            2               1
       efficient way.
    b. The information will be
                                              5          4             3            2               1
       useful/relevant to me.
    c.   The material was presented at
         a level appropriate to my            5          4             3            2               1
         background and level.
    d. Overall, I was satisfied with the
                                              5          4             3            2               1

4. What part of the video was most useful to you?

5. What part of the video was least useful to you?

6. What suggestions do you have for improving this video?

Thank you for completing this video evaluation! ATPO values your feedback. Please return your
evaluation form with the completed quiz and payment.

To top