Test Reviews

Question 1

If a rigid lens decenters off of the cornea:
A. gently massage the lens back to center through the lids
B. gently pop it off with a fingernail
C. place a finger directly on the lens and slide it back on
D. all of the above

Answer 1

All of the above

Question 2

Post fit evaluations will show
A. Hypoxia
B. solution reactions
C. mechanical problems
D. all of the above

Answer 2

all of the above

Question 3

On a compromised cornea, such as one that has undergone a corneal graft, what lens characteristic
would be most beneficial?

Answer 3

high Dk/t

Question 4

On a true aspheric lens it is not possible to measure the …

Answer 4

Optical zone

Question 5

When fitting soft contact lenses, one should aim to fit the _____lens possible that will provide adequate
coverage.
A. largest
B. flattest
C. smallest
D. steepest

Answer 5

Flattest

Question 6

Poor GP insertion or recentering techniques may result in:
A. the lack of a fulcrum at 3 & 9 o’clock
B. 3 & 9 staining
C. arcuate staining
D. coalesced SPK

Answer 6

Arcuate Staining

Question 7

Which of the following lens designs would most likely be used for correction of residual astigmatism?
A. spherical
B. bitoric
C. back toric
D. front toric

Answer 7

Front toric

Question 8

Which of the following medications may affect successful contact lens wear?
a. Antacids
b. Antihistamines
c. Aspirin
d. Laxatives

Answer 8

Antihistamines

Question 9

4. The cornea receives nutrients from:
   1) Aqueous humor
   2) Tears
   3) Limbal blood vessels
   4) Orbicularis occuli

Answer 9

1) Aqueous humor
2) Tears
3) Limbal blood vessels

Question 10

If the manufacturer’s guidelines suggest a minimum of 4 hours for disinfection, what would you suggest to the patient?
a) Never leave lenses in disinfectant overnight
b) 2 to 3 hours is probably enough
c) Use surfactant cleaner and preserved saline
d) A minimum of 4 hours is required

Answer 10

d) A minimum of 4 hours is required

Question 11

13. Which auxiliary trial lens will extend the keratometer to approximately 30.00 D?
    a) +1.00 D
    b) +1.25 D
    c) -1.00 D

Answer 11

c)-1.00 D

13. Which auxiliary trial lens will extend the keratometer to approximately 30.00 D?
    a) +1.00 D
    b) +1.25 D
    c) -1.00 D

By placing a -1.00 D lens over the aperture of the keratometer, you can extend the low-end range from 36.00 D to
30.00 D.

Question 12

The following is an example of what type of astigmatism? K’s 44.00 @ 180 / 44.50 @ 90
Rx -3.00 -2.50 x 180
a) Lenticular astigmatism
b) Against-the-rule astigmatism
c) Irregular astigmatism
d) Oblique astigmatism

Answer 12

Lenticular astigmatism

Lenticular astigmatism is present when there is significantly more astigmatism in the patient’s refraction (2.50 D) than
on their corneal surface (0.50 D). In this case, the astigmatism is not represented on the cornea and is most likely
found in the crystalline lens.

Question 13

Ocular signs, of aging include:
1) Tear film abnormalities
2) Reduced lid elasticity
3) Lens opacities
4) Loss of accommodation
a) 1 only
b) 1 & 3
c) 2 & 4
d) All of the above

Answer 13

All of the above

Question 14

Epithelium, Bowman’s membrane, Stroma, Descemet’s membrane, Endothelium

Answer 14

In alpha out

Question 15

The normal cornea is transparent due to the pump action creating proper fluid balance. Which layer of the cornea
is most responsible for maintaining this function?
a) Endothelium
b) Basal membrane
c) Epithelium
d) Bowman’s membrane

Answer 15

Endothelium

Question 16

A normal tear break up time is:
a) 6 –7 seconds
b) 10 – 12 seconds
c) Less than 5 seconds
d) None of the above

Answer 16

10-12 seconds

Question 17

A whitish haze in the peripheral corneal stroma which does not stain and is often seen in the elderly is known as:
a) Neovascularization
b) Dellen
c) Arcus Senilus
d) Fuch’s Dystrophy

Answer 17

c) arcus senilus

Question 18

25. The following Rx represents: OD +2.00 = 20 / 20
    OS -3.00 -2.00 x 180 = 20 / 20
    a) Presbyopia
    b) Anisometropia
    c) Amblyopia
    d) Emmetropia

Answer 18

anisometropia

Question 19

The anisometropia patient will best achieve stereopsis with which of the following modalities?
a) Contact lenses
b) Spectacles
c) IOL
d) Scleral lenses

Answer 19

contact lenses

Question 20

The keratometer is an instrument used to measure:
a) Corneal curvature
b) Lens power
c) Lens diameter
d) Lens thickness

Answer 20

Corneal curvature

Question 21

An instrument used to evaluate corneal irregularity by reflecting concentric circles from the patient’s cornea is
called a:
a) Burton Lamp
b) Con-Ta-Chek
c) Topogometer
d) Placido Disk

Answer 21

Placido Disk

A Burton lamp evaluates fluorescein patterns in the absence of a slit lamp. A Con-Ta-Chek is an attachment to the
keratometer that enables one to read the base curve in the absence of a radiuscope.
A topogometer is also an attachment for the keratometer and is used to define the corneal apex

Question 22

Which auxiliary trial lens will extend the keratometer to approximately 61.00 D?
a) -1.25 D
b) +1.25 D
c) -1.50 D
d) D.+1.50 D

Answer 22

+1.25 D

Question 23

Wearing lenses in high attitudes and dry environments may result in complaints of all but the following:
a) Photophobia
b) Chalazion
c) Grittiness
d) Burning sensation

Answer 23

Chalazion

Question 24

Patients with which of the following occupations can successfully wear contact lenses?
a) Arc welders
b) Firefighters
c) Teachers
d) All of the above

Answer 24

all of the above

Question 25

Transient keratometric mire distortion is usually due to:

Answer 25

pre-ocular tear film

Question 26

Irregular mires on a keratometer may be indicative of: a) Dry eyes or excessive mucoid secretions b) Keratoconus c) Contact lens induced corneal warpage d) All of the above

Answer 26

all of the above Dry eyes with rapid tear film break-up time will cause the keratometer mires to blur and appear irregular soon after a blink, as the tear film breaks up. Mucoid secretions will create an irregular surface on the cornea. Patients with keratoconus have irregular astigmatism and therefore irregular mires, as do patients with contact lens induced corneal warpage.

Question 27

In an alignment lid attachment RGP fit, the fluorescein pattern should show:

Answer 27

A thin, even layer of fluorescein and less than 180 degrees of bearing in the mid-periphery This allows for good tear exchange with each blink

Question 28

In an RGP wearer, an arcuate stain on the cornea may be due to:

Answer 28

Poorly blended secondary curves

Question 29

an RGP wearer has 3 and 9 o'clock staining because

Answer 29

failure to close the lids completely when blinking

Question 30

An RGP lens fit excessively flat would cause...

Answer 30

Apical staining

Question 31

What would usually cause a very fine, diffuse superficial punctate keratitis (SPK) from limbus to limbus in an RGP wearer

Answer 31

Solution Sensitivity

Question 32

In a Schirmer I test

Answer 32

A patient with an unanesthetized eye and normal tear output should wet at least 15 mm of the filter paper in 5 minutes

Question 33

In a Schirmer II test:

Answer 33

An anesthetic drop is instilled before the Schirmer strip is inserted to eliminate the reflex tearing caused by the filter paper

Question 34

Rose Bengal test

Answer 34

Will stain devitalized conjunctival epithelial cells brightly

Question 35

A patient wearing a high horizontal prismatic correction for a motility problem

Answer 35

May experience diplopia when fit with contact lenses

Question 36

A pre-presbyopic myopic patient who is still able to read with single vision glasses may find that:

Answer 36

They are unable to see fine print when fit with contact lenses Contact lenses require myopic patients to use more accommodation and convergence than spectacles. Patients who are approaching presbyopia may find that their near vision is still adequate with glasses but cannot see small print when fit with contact lenses.

Question 37

Amy's +8.50 D spectacles sit 12 mm from the cornea. The power of a soft contact lens for Amy, properly vertexed, would be:

Answer 37

+9.50 D

Question 38

Which of the following choices would work best for the patient's visual needs, given the following information: K's 44.00 @ 180 / 45.25 @ 90 Rx -3.00 +0.25 x 90

Answer 38

Spherical soft lens The patient's refractive astigmatism is 0.25 diopters, which is essentially a spherical correction. A soft spherical lens will correct this although corneal astigmatism is present

Question 39

Which of the following set of lens specifications would best simulate an intrapalpebral RGP fitting given the following information: K's 42.00 @ 180 / 43.00 @ 90 Rx -2.00 -1.00 x 180 Upper lid positions 2 mm above the superior limbus a) 42.50 -2-50 8.5 b) 42.00 -2.00 9.5 c) 41.50 -1.50 8.5 d) 41.50 -1.50 9.5

Answer 39

42.50 -2.50 8.5 An intrapalpebral fit is a small diameter, steep fitting lens designed to center between the upper and lower eyelids. The other choices are either large diameter or flat fitting lenses.

Question 40

Which contact lens would best correct this patient's visual needs, given the following information: K's 46.00 @ 180 / 45.50 @ 90 Rx -3.00 -1.50 x 90

Answer 40

Soft toric lens RGP lenses tend to decenter on against-the-rule corneas. There is not enough corneal toricity for an RGP lens with toric curves on the back surface to stabilize.