A Correct Statement regarding epithelial cells is that they:
a)Comprise the posterior layer of the cornea
b)Are unable to regenerate
c)Comprise the thickest layer of the cornea d) Have the ability to reproduce - correctanswer-d) have the ability to reproduce
Which of the following prescriptions...
A Correct Statement regarding epithelial cells is that they:
a)Comprise the posterior layer of the cornea
b)Are unable to regenerate
c)Comprise the thickest layer of the cornea
d) Have the ability to reproduce - correctanswer-d) have the ability to reproduce
Which of the following prescriptions indicates against-the-rule astigmatism?
a)-4.50 +1.00 x75
b)-4.50 +1.00 x 180
c)-4.50 -1.00 x 165
d)4.50 -1.00 x 180 - correctanswer-a)-4.50 +1.00 x75
When a keratometer is being calibrated, which of the following targets will provide the most reliable
result?
a)the single-cut anterior surface of a high-plus lens
b)a perfectly flat highly polished mirror
c) a set of steell balls of known radii
d)the unfinished posterior surface of a low-minus lens - correctanswer-c) a set of steel balls of known
radii
Inadequate movement of a soft lens can be corrected by using a lens that
a) has a steeper base curve
,b) has a smaller diameter
c) has a larger diameter
d) has a higher water content - correctanswer-b)has a smaller diameter
A long-term, successful, hydrogel contact lens wearer suddenly develops dry eyes. Which of the
following is most likely to cause this problem?
a) Use of oxidative solution
b) use of rewetting drops
c) use of anti-histamines
d) Wearing of lenses in the wrong eyes - correctanswer-c) use of anti-histamines
During slit-lamp evaluation, on upward gaze, a patient's soft contact lenses move 0.5 to 1mm when the
patient blinks. These lenses are:
a) a good fit
b) too loose
c) too tight
d) too large - correctanswer-a) a good fit
A new daily wearer of soft lenses returns for the first follow up visit with itching, burning, injected eyes.
The most likely cause of these problems is:
a) solution reaction
b) giant-cell papillary conjunctivitis
c) a lens fit that is too loose
d) inability to wear soft lenses - correctanswer-a) solution reaction
Which of the following is the mode of slit-lamp illumination used to view the early stages of microcystic
edema?
In using fluorescein to evaluate the fit of a rigid lens of 9.0mm diameter on a typical eye, a correct
statement is that:
a) apical touch with pooling in the PPC curve area is preferred
b) apical toxicity may not be obvious
c) apical pooling with edge touch is recommended
d) apical area, mid-peripheral area, and the lens edges should be assessed - correctanswer-d) apical
area, mid-peripheral area, and the lens edges should be assessed
Which of the following changes would improve a rigid contact lens fit that shows sluggish movement
after 1 hour of wear?
, Moving a +7.50 RX from the spectacle plane to the corneal plane will require:
a) no change in power
b) more minus power
c) more plus power
d) less plus power - correctanswer-c) more plus power
A fluorescein pattern that has a black area over the corneal apex and a diffuse green area in the
periphery normally indicates:
a) flat fit
b) steep fit
c) normal fit
d) tight fit - correctanswer-a) flat fit
IPC's are used to:
a) provide a transition between the peripheral and base curves
b) reduce edge thickness and lens mass
c) increase the optical zone
d) smooth the lens edge - correctanswer-a) provide a transition between the peripheral and base curves
A toric soft lens with an RX of -2.00 -1.25 x 120 has the axis resting at the 5 o' clock position. What
should the new axis be when the lens is ordered?
a) 90 degrees
b) 105 degrees
c) 135 degrees
d) 150 degrees - correctanswer-a) 90 degrees
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