NCLE PRACTICE TEST QUESTIONS
WITH 100% CORRECT ANSWERS
When a silicone hydrogel lens is used as a cushion between the cornea and a GP lens
it is called:
a) bandage lens fitting
b) semi scleral fitting
c) hybrid lens fitting
d) piggyback fitting - Answer- a) bandage lens fitting
The appearance of transient bubbles near the periphery of a contact lens is indicative
of:
a) a steep base curve
b) flat posterior peripheral curves
c) a large optical zone
d) narrow posterior peripheral curves - Answer- b) flat posterior peripheral curves
A soft lens patient has a spectacle correction of +8.50D at a vertex of 12mm. What
would be the most appropriate sphere power?
a) +7.50D
b) +8.00D
c) +8.50D
d) +9.50D - Answer- d) +9.50D
The normal cornea is:
a) 50% water
b) three layers thick
c) avascular
d) translucent - Answer- c) avascular
The evaluation of a rigid lens detects centrally, minimal lens movement, and poor tear
exchange. Which of the following lens changes would be most appropriate?
a) Increase the diameter
b) Reduce the diameter
c) Steepen the base curve
d) Increase the optical zone diameter - Answer- b) Reduce the diameter
,Given the following information:
"K" 41.00@180/44.50@90
Spectacle RX: -2.00 -1.50 x090
A contact lens fitter should be alert to which of the following problems?
a) a tight lens fit
b) residual astigmatism
c) oblique astigmatism
d) a loose lens fit - Answer- b) residual astigmatism
A rigid lens of 45.00D/-4.00, provides 20/20 vision. What power would be needed if the
central posterior curve(base curve) is changed to 45.50D?
a) -3.50
b) -4.25
c) -4.50
d) -5.00 - Answer- c) -4.50
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 - Answer- 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 - Answer- 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 - Answer- 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 - Answer- 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 - Answer- 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 - Answer- 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 - Answer- a) solution reaction
Which of the following is the mode of slit-lamp illumination used to view the early stages
of microcystic edema?
a) Retroillumination
b) Direct illumination
c) Parrallelpiped
d) Oscillation - Answer- a) Retroillumination
Which of the following changes is best able to improve oxygen transmissibility to a
patient's cornea?
a) Increasing tear exchange
b) Increasing Dk
c) Increasing optical zone diameter
d) Increasing CN bevel - Answer- b) Increasing Dk
In using fluorescein to evaluate the fit of a rigid lens of 9.0mm diameter on a typical eye,
a correct statement is that:
WITH 100% CORRECT ANSWERS
When a silicone hydrogel lens is used as a cushion between the cornea and a GP lens
it is called:
a) bandage lens fitting
b) semi scleral fitting
c) hybrid lens fitting
d) piggyback fitting - Answer- a) bandage lens fitting
The appearance of transient bubbles near the periphery of a contact lens is indicative
of:
a) a steep base curve
b) flat posterior peripheral curves
c) a large optical zone
d) narrow posterior peripheral curves - Answer- b) flat posterior peripheral curves
A soft lens patient has a spectacle correction of +8.50D at a vertex of 12mm. What
would be the most appropriate sphere power?
a) +7.50D
b) +8.00D
c) +8.50D
d) +9.50D - Answer- d) +9.50D
The normal cornea is:
a) 50% water
b) three layers thick
c) avascular
d) translucent - Answer- c) avascular
The evaluation of a rigid lens detects centrally, minimal lens movement, and poor tear
exchange. Which of the following lens changes would be most appropriate?
a) Increase the diameter
b) Reduce the diameter
c) Steepen the base curve
d) Increase the optical zone diameter - Answer- b) Reduce the diameter
,Given the following information:
"K" 41.00@180/44.50@90
Spectacle RX: -2.00 -1.50 x090
A contact lens fitter should be alert to which of the following problems?
a) a tight lens fit
b) residual astigmatism
c) oblique astigmatism
d) a loose lens fit - Answer- b) residual astigmatism
A rigid lens of 45.00D/-4.00, provides 20/20 vision. What power would be needed if the
central posterior curve(base curve) is changed to 45.50D?
a) -3.50
b) -4.25
c) -4.50
d) -5.00 - Answer- c) -4.50
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 - Answer- 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 - Answer- 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 - Answer- 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 - Answer- 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 - Answer- 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 - Answer- 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 - Answer- a) solution reaction
Which of the following is the mode of slit-lamp illumination used to view the early stages
of microcystic edema?
a) Retroillumination
b) Direct illumination
c) Parrallelpiped
d) Oscillation - Answer- a) Retroillumination
Which of the following changes is best able to improve oxygen transmissibility to a
patient's cornea?
a) Increasing tear exchange
b) Increasing Dk
c) Increasing optical zone diameter
d) Increasing CN bevel - Answer- b) Increasing Dk
In using fluorescein to evaluate the fit of a rigid lens of 9.0mm diameter on a typical eye,
a correct statement is that:
