# DISPENSING EXAM

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```					GERT – HIERDIE IS DIE MODULE 3 OFFICE ASSISTANT EXAM
– NET SONDER DIE LAASTE 4 VRAE.

QUESTION 1
The simplest form of spectacle or contact lens is the ______________ lens.
1 mark
a) Trifocal
b) Multifocal
c) Single vision
d) Bifocal

QUESTION 2
In single vision lenses, ______________lenses are used to correct short sight. 1
mark
a) Convex
b) Trivex
c) Concave
d) Flat

QUESTION 3
In single vision lenses, __________ lenses correct long sight. 1 mark
a) Convex
b) Concave
c) Bifocal
d) Plano

QUESTION 4
A concave lens is generally ____________ in the centre than at the edge. 1
mark
a) thicker
b) thinner
c) equal
d) denser

1
QUESTION 5
What features of the lens will depend on the amount of long or short sight it is
designed to correct? 3 marks
a) The thickness, the width and the density
b) The curvature, the size and the weight
c) The curvature, the thickness and weight
d) The thickness, the weight and the lens material

QUESTION 6
What will also influence the thickness and weight of your lenses? 3 marks
a) The lens material, the size and shape of the spectacle frame.
b) The density of the lens, the size of the spectacle frame and the size of the
lenses
c) The size and shape of the spectacle frame and the material of the
spectacle frame
d) The lens material, the script of the patient and the size of the spectacle
frame

QUESTION 7
Single vision lenses have _________________________. 2 marks
a) a higher optical power at the centre of the lens.
b) a higher optical power at the edge of the lens.
c) An equal optical power throughout the lens.

QUESTION 8
When patients develop ____________, they need a different optical power to see
clearly at distance and near. 1 mark
a) Hyperopia
b) Presbyopia
c) Myopia
d) Cataracts

2
QUESTION 9
When fitting single vision lenses, the following advice is important:   2 marks
a) Ensure the frame is correctly fitted and the pupillary distance is correct.
b) Ensure the pupillary distance is correct and use trivex lenses in high
scripts.
c) Ensure the pupil sits in the centre of the spectacle frame lens and that
anti-reflective coating is used on the lenses.
d) Ensure that the pupillary distance is correct and use High Refractive Index
lenses in high scripts.

QUESTION 10

Bifocal lenses contain ________ optical corrections. 1 mark
a) single
b) two
c) three
d) multiple

QUESTION 11
In a bifocal lens, the upper part of the lens corrects ___________ vision and the
lower half corrects __________ vision. 2 marks
a) distance ; near
b) distance ; intermediate
c) intermediate ; near
d) distance ; computer

3
QUESTION 12
Bifocals are available in ______ and ______ segment widths. 2 marks
a) 25mm and 28mm
b) 25mm and 35mm
c) 28mm and 35mm
d) 25mm and 32mm

QUESTION 13
When looking through a bifocal lens, the movement from distance to near will
cause __________________. 1 mark
a) nausea
b) dizziness
c) accommodation
d) image jump

QUESTION 14
With   regard     to   bifocal   lenses,     the   most   common    complaint   is
________________. 1 mark
a) image jump
b) blurring at the edges of the vision.
c) intrusion of the eye
d) difficult intermediate vision

QUESTION 15
What is the minimum seg height for a bifocal for an adult? 1 mark
a) 15mm
b) 12mm
c) 13m
d) 14mm

4
QUESTION 16

In a trifocal lens, the middle window conveys _________________ vision. 1 mark
a) distance
b) near
c) computer
d) intermediate

QUESTION 17
A trifocal lens is fitted at the ____________________. 1 mark
a) lower lid
b) centre of the eye
c) lower pupil
d) upper pupil

QUESTION 18
Progressive lenses are also known as _________________. 1 mark
a) Multifocals
b) Trivex lenses
c) High refractive lenses
d) No-line bifocals

QUESTION 19
______________, ______________ and _______________ is important to
ensure the proper adaptation to progressive lenses. 3 marks
a) Proper fitting, adjustment and instruction on their proper use.
b) Adjustment, proper measurements and instruction on their proper use
c) Instructions on their proper use, proper fitting and correct positioning over
the pupil.
d) Proper measurements, correct frame fitting and instruction on their proper
use.

5
QUESTION 20
What was the first lens material used to make modern-day eyeglasses? 1 mark
a) Plastic
b) Glass
c) CR39
d) Polycarbonate

QUESTION 21
The minimum centre thickness of a glass lens is ___________. 1 mark
a) 1.0 mm
b) 2.0 mm
c) 3.0 mm
d) 4.0 mm

6
QUESTION 22
4 negative aspects of glass is:   4 marks
1) Scratches easily
2) heavy to wear
3) uncomfortable, constantly slides down the nose
4) causes ring-like reflections on the lens
5) causes blurring of vision at edges of lens
6) strong minus prescriptions have unsightly edges giving the notorious "coke
bottle" effect or the typical "bug eye" look of high plus prescriptions
7) Cannot be used in rimless spectacle frames
8) poor impact resistance
9) The photo chromatic lenses are not as effective as transitions

a) 1,3,6,7
b) 2,3,6,8
c) 1,4,5,8
d) 2,3,6,7

QUESTION 23
Conventional plastic lenses provide _______ impact resistance than glass, but
has ______ resistance than newer lens materials like polycarbonate and
polyurethane high index plastic. 2 marks
a) more;less
b) equal;more
c) less;more
d) the same ; the same

7
QUESTION 24
Name 2 positive qualities of conventional plastic lenses? 2 marks
1) Contains anti-reflective qualities
2) light and more comfortable
3) impact resistant
4) scratch resistant
5) more cost-effective

a) 1, 3
b) 2,4
c) 4,5
d) 2,3

QUESTION 25
High-index plastic is used to significantly reduce _______________. 1 mark
a) scratching
b) weight
c) lens thickness
d) breakages

QUESTION 26
High index plastic lens and ______________________ combined result in
optimally thinner lenses. 1 mark
a) optimal frame selection
b) trivex
c) the eye situated in the centre of the lens
d) optimal papillary distance

8
QUESTION 27
1.66 high index plastic lenses are ____% thinner and lighter than conventional or
ordinary plastic lenses. 1 mark
a) 27%
b) 50%
c) 60%
d) 80%

QUESTION 28
The term “aspheric” relates to the _________ of a lens surface. 1 mark
a) shape
b) thinness
c) weight
d) design

QUESTION 29
Aspherical    lenses   are    designed     to   reduce    ____________       and
_______________. 2 marks
a) weight and lens thickness
b) reflections and scratching
c) distortion and lens thickness
d) distortion and lens scratching

QUESTION 30
What does grey lenses offer good protection against? 1 mark
a) the sun
b) UVA and UVB rays
c) Heat
d) Glare

9
QUESTION 31
Green tints offer the highest ___________. 1 mark
a) sun protection
b) protection against glare
c) contrast
d) visual acuity

QUESTION 32
What process do manufacturers employ to tint lenses? 1 mark
a) Colouration
b) Constant density
c) Chemical colouration
d) Colour sealing

QUESTION 33
When the vibrations from light are aligned into one or more planes of direction,
the light is said to be __________________. 1 mark
a) Reflected
b) Polarized
c) Ultra-violet
d) dangerous

10
QUESTION 34
What are lenses called that darken when exposed to the sun? 1 mark
a) photochromic lenses
b) polarized lenses
c) anti-reflective lenses
d) UV protective lenses

QUESTION 35
How do photochromic lenses darken? 3 marks
a) Molecules in the lenses vibrate when exposed to UV light, resulting in
them heating up and causing a change in colour in the silver halide
molecules.
b) Molecules of silver halide in the lenses, change colour when exposed to
UV light
c) Molecules embedded in the lenses undergo a chemical process when
exposed to UV light causing them to change shape and absorb portions of
visible light, causing the lenses to darken.

QUESTION 36
What 2 materials are used widely for scratch resistant or hard coatings?     2
marks
a) Polycarbonate and quartz
b) Silver acetate and silver hidrate
c) Diamond-like carbon and polycrystalline diamond
d) Sodium hydroxide and diamond oxide

11
QUESTION 37

What is the purpose of the anti-reflective coating? 1 mark

a)   To eliminate reflections on lens surfaces
b)   To reduce UV rays passing through the lens
c)   The reduce scratching of the lens
d)   To darken when taken into the sun

QUESTION 38
ViewProtect’s coating biggest benefit for wearers of AR coatings is ……….. 1
mark
a) It reduces lens maintenance time
b) It reduces UVA and UVB absorption
c) It reduces scratching of the lens
d) It reduces the pinkish-greenish shine on the lenses.

QUESTION 39
Some of the most serious eye problems can be linked to ___________. 1 mark
a) Sunlight
b) Pollution
c) UV light
d) X-rays

12
QUESTION 40
Fill in the missing spaces. The cornea of your eye absorbs all of the UV-B and
most of the UV-A light. But over time, this absorption can lead to ____________.
And the small amount of UV-A which gets past your cornea, can eventually lead
to _____________________. Intense and prolonged exposure to UV radiation
can cause either cancer of the eye or _________________, which is basically
sunburn on your retina. 3 marks
a) Hyperopia ; myopia and presbyopia
b) Presbyopia ; macular degeneration and squints
c) Cataracts; glaucoma and photokeratitis
d) Cataracts; macular degeneration and photokeratitis

QUESTION 41
One prism diopter is defined as ___________________________________. 2
marks
a) the prism power needed to diverge a ray of light 1 centimeter at a distance of
one meter.
b) the prism power needed to deviate a ray of light 1 centimeter at a distance of
one meter.
c) the prism power needed to converge a ray of light 1 millimeter at a distance of
one meter

d) the prism power need to deviate a ray of light 1 millimeter at a distance of ten
meters

QUESTION 42
The higher the diopter, the _____________ the lens. 1 mark
a) weaker
b) lighter
c) stronger
d) darker

13
QUESTION 43
_____________ are commonly used to correct astigmatism. 1 mark
a) cylinder curves
b) spherical curves
c) axial curves
d) straight curves

QUESTIONS 44
What are the 4 parts of a prescription?      4 marks
1) The base (spherical) strength and type (plus or minus)
2) The type of spherical strength
3)The cylinder strength
4) The axial orientation of the spherical strength
5) The ADD of the bifocal or varifocal
6)The cylinder axis orientation
7) The papillary distance
8)The strength of bifocal segment ("plus" indicating "in addition") and type
9) The prism of the lens and whether it is base in or base out

a) 1,2,3,4
b) 1,3,6,8
c) 2,3,4,7
d) 1,3,4,5

14
QUESTION 45
Why are papillary measurements important? 1 mark
a) They enhance the appearance of the lens over the eye
b) They allow that the lens is centered over the eye
c) It ensures that the rays of light diverge correctly into the eye
d) They allow the optical centers of the lens to be situated directly in front of
the pupils.

QUESTION 46

What is one of the most common causes of multifocal discomfort? 1 mark

a) Inaccurate papillary distance measurements

b) Inaccurate segment placement

d) Wrongly positioned zones

15
QUESTION 47
What can the Lensometer inspect lenses for? 5 marks
1) Total dioptric power
2) Degree of Myopia
4) Axis and alignment
5) Possible glaucoma
6) Pupillary distance
7) Optical centre placement
8) Horizontal axis
9) Vertical axis
10)Prismatic effect

a) 1,2,3,4,5
b) 1,3,4,7,10
c) 2,5,6,7,9,10
d) 1,3,4,6,7

QUESTION 48
Pantoscopic/retroscopic angles refer to ______________________________
______________. 1 mark
a) The facial frame alignment in the back and forth meridian
b) The alignment of the frame along both facial planes
c) The facial frame alignment in the up and down meridian.
d) The angle between the nose pads and the front surface of the frame

16
QUESTION 49
"Open temple angle" refers to
The position of the temples when the temples are not folded back on the frame is
referred to as __________________. 1 mark
a) pantoscopic angle
b) retroscopic angle
c) vertex distance
d) open temple angle

QUESTION 50
A sure sign of temple wrap that is too narrow is _______________. 1 mark
a) Pressure points on the wearer’s nose
b) Red marks behind the wearer’s ears
c) An open temple angle greater that 90 degrees
d) Indentations in the wearer’s temples.

QUESTION 51
Where is the ideal location of the over-the-ear bend with regard to temple tips? 1
mark
a) In front of the point where the temple makes contact with the top of the ear
b) Just behind the point where the temples make its last contact with the top
of the ear.
c) About a centimeter behind the point where the temple makes contact the
top of the ear
d) At the point where the temple makes contact with the top of the ear.

17
QUESTION 52
What contact lenses are used to help correct astigmatism? 1 mark
a) toric contact lenses
b) disposable contact lenses
c) aspheric contact lenses
d) Hard contact lenses

QUESTION 53
What is the result of insufficient tearing in contact lens wearers? 1 mark
a) Astigmatism
b) Glaucoma
c) Macular degeneration
d) Dry eye syndrome

QUESTION 54
Soft contacts can be used to treat __________ and ____________ only.          2
marks
a) hyperopia and astigmatism
b) myopia and hyperopia
c) myopia and presbyopia
d) presbyopia and astigmatism

QUESTION 55
What is an alternative to bifocals? 1 mark
a) soft contact lenses
b) disposable contact lenses
c) rigid or gas permeable contact lenses
d) monovision contact lenses

18
Monocular
PD - L

QUESTION 56
What 4 symptoms is immediate cause to remove contact lenses? 4 marks
1) Scratching
2) Burning
3) Redness
4) Secretion
5) Dryness
6) Vision-change
7) Excessive watering of eyes
8) Pain

a) 1,2,3,4
b) 3,4,6,8
c) 1,3,5,6
d) 1,3,6,8

QUESTION 57
After customer service, it is the single biggest advantage any practice has over
their opposition is _____________________. 1 mark
a) effective stock management
b) effective debtors management
c) effective staff management
d) effective marketing

TOTAL : 90 MARKS
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