NCLE Practice Test QUESTIONS AND ANSWERS| GRADED A
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 Correct 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 Correct 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 Correct 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 Correct 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 Correct 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 Correct 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 Correct 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 Correct 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 Correct 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:
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 Correct Answer: 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?
a) Add hyperflange edge treatment
b) Reduce overall diameter
c) Decrease center thickness
d) Increase overall diameter Correct Answer: b) Reduce overall diameter
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 Correct Answer: 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 Correct Answer: 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 Correct Answer: 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 Correct Answer: a) 90 degrees
Upon initial insertion of a GP lens, the patient complains about flare. To correct this problem, the
fitter should choose a lens with a/an:
a) increased base curve
b) increased optical zone
c) decreased optical zone
d) flattened base curve Correct Answer: b) increased optical zone
Which curve would a fitter modify to allow more tear flow under the edge of a rigid lens?
a) Posterior peripheral curve
b) Optical curve
c) Anterior peripheral curve
d) Anterior central curve Correct Answer: a) Posterior peripheral curve
If a well fitted diagnostic lens has a -3.00 power and the over-refraction at 12mm is -2.00, the
correct lens power to order is:
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 Correct 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 Correct 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 Correct 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 Correct 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 Correct 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 Correct 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 Correct 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 Correct 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 Correct 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:
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 Correct Answer: 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?
a) Add hyperflange edge treatment
b) Reduce overall diameter
c) Decrease center thickness
d) Increase overall diameter Correct Answer: b) Reduce overall diameter
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 Correct Answer: 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 Correct Answer: 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 Correct Answer: 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 Correct Answer: a) 90 degrees
Upon initial insertion of a GP lens, the patient complains about flare. To correct this problem, the
fitter should choose a lens with a/an:
a) increased base curve
b) increased optical zone
c) decreased optical zone
d) flattened base curve Correct Answer: b) increased optical zone
Which curve would a fitter modify to allow more tear flow under the edge of a rigid lens?
a) Posterior peripheral curve
b) Optical curve
c) Anterior peripheral curve
d) Anterior central curve Correct Answer: a) Posterior peripheral curve
If a well fitted diagnostic lens has a -3.00 power and the over-refraction at 12mm is -2.00, the
correct lens power to order is:
