1|Page
NCLE ADVANCED CERTIFICATION ACTUAL
EXAM PREP TEST BANK ALL QUESTIONS AND
CORRECT DETAILED ANSWERS WITH
RATIONALES ALREADY A GRADED WITH
EXPERT FEEDBACK |CURRENTLY TESTING |
NEW AND REVISED
1. The sagittal depth of a rigid gas permeable contact lens can be altered
without changing the diameter by:
A. Changing the power
B. Changing the edge design
C. Changing the radius of curvature of the anterior optical zone
D. Changing the radius of curvature of the posterior optical zone -
ANSWER- The answer is D.
The posterior optical zone will directly affect the lens to cornea
relationship of a rigid gas permeable lens. If the posterior optical
zone is steepened, it will increase the sagittal depth. If it is flattened,
it will decrease the sagittal depth. Changing the power, which is
accomplished by changing the anterior optical zone, will not affect
the sagittal depth of the lens, nor will changing its edge design.
2. A truncation is used on a rigid gas permeable contact lens to help
enhance the performance of which type of design?
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A. Bifocal
B. Aphakic
C. Bitoric
D. Keratoconus - ANSWER- The answer is A.
A lens is truncated by removing a segment of the lower edge of a
contact lens. This creates a straight edge that interacts with the
lower lid and aids in lens positioning. Of the lens designs listed in the
question, the only one that requires precise positioning of its optical
portions is a translating bifocal lens.
3. The mass of an aphakic rigid gas permeable contact lens can be
reduced by making the lens design:
A. Spherical
B. Lenticular
C. Tricurve
D. Aspheric - ANSWER- The answer is B.
A lenticular or myoflange design will decrease the mass of an
aphakic lens as well as increase the edge profile, which allows it to
interact more with the upper lid and aid in positioning of the lens.
4. In order to tighten the fit of a rigid gas permeable lens you can:
,3|Page
I. Increase the optical zone diameter
2. Decrease the optical zone diameter
3. Increase the overall lens diameter
4. Use a prism ballasted lens design
A. 3 only
B. 1&3
C. 2 only
D. 2&3 - ANSWER- The answer is B.
Increasing the optical zone diameter and increasing the overall lens
diameter will both tighten and steepen the relationship of the lens to
the cornea. Decreasing the optic zone diameter will serve to flatten
and loosen the lens to cornea relationship. Using a prism-ballasted
lens design will not affect the lens to cornea relationship as it relates
to sagittal depth.
5. A high minus rigid gas permeable lens will be thin centrally with
relatively thick edges. To reduce the edge thickness, and increase overall
comfort, use:
A. Aspheric peripheral curves
B. A myoflange
C. A higher Dk material
D. A hyperflange - ANSWER- The answer is D.
, 4|Page
A hyperflange will decrease edge thickness as well as lens awareness
. Aspheric peripheral curves change the posterior design of the lens
but do not reduce edge thickness. A higher Dk material will not
change the overall lens edge thickness. A myoflange will actually
add thickness to the lens edge and is used for high plus lenses not
high minus lenses.
6. To add minus power to a rigid contact lens with a rotating modifying
spindle, one would:
A. Polish the posterior surface of the rigid lens
B. Polish the mid peripheral anterior surface
C. Polish the central anterior surface
D. Polish the peripheral anterior surface - ANSWER- The answer is C.
One would rarely polish or attempt to manipulate the central
posterior surface of a rigid lens. Applying polishing pressure to the
mid-peripheral and the peripheral anterior surface would add plus
power. Applying polishing pressure to the central anterior surface
would add minus power.
7. Which lens design would provide the best visual acuity for a patient
with the following information?
K's 42.00@ 180/ 42.50@90
Rx -6.75 +1.75 cx 90
NCLE ADVANCED CERTIFICATION ACTUAL
EXAM PREP TEST BANK ALL QUESTIONS AND
CORRECT DETAILED ANSWERS WITH
RATIONALES ALREADY A GRADED WITH
EXPERT FEEDBACK |CURRENTLY TESTING |
NEW AND REVISED
1. The sagittal depth of a rigid gas permeable contact lens can be altered
without changing the diameter by:
A. Changing the power
B. Changing the edge design
C. Changing the radius of curvature of the anterior optical zone
D. Changing the radius of curvature of the posterior optical zone -
ANSWER- The answer is D.
The posterior optical zone will directly affect the lens to cornea
relationship of a rigid gas permeable lens. If the posterior optical
zone is steepened, it will increase the sagittal depth. If it is flattened,
it will decrease the sagittal depth. Changing the power, which is
accomplished by changing the anterior optical zone, will not affect
the sagittal depth of the lens, nor will changing its edge design.
2. A truncation is used on a rigid gas permeable contact lens to help
enhance the performance of which type of design?
,2|Page
A. Bifocal
B. Aphakic
C. Bitoric
D. Keratoconus - ANSWER- The answer is A.
A lens is truncated by removing a segment of the lower edge of a
contact lens. This creates a straight edge that interacts with the
lower lid and aids in lens positioning. Of the lens designs listed in the
question, the only one that requires precise positioning of its optical
portions is a translating bifocal lens.
3. The mass of an aphakic rigid gas permeable contact lens can be
reduced by making the lens design:
A. Spherical
B. Lenticular
C. Tricurve
D. Aspheric - ANSWER- The answer is B.
A lenticular or myoflange design will decrease the mass of an
aphakic lens as well as increase the edge profile, which allows it to
interact more with the upper lid and aid in positioning of the lens.
4. In order to tighten the fit of a rigid gas permeable lens you can:
,3|Page
I. Increase the optical zone diameter
2. Decrease the optical zone diameter
3. Increase the overall lens diameter
4. Use a prism ballasted lens design
A. 3 only
B. 1&3
C. 2 only
D. 2&3 - ANSWER- The answer is B.
Increasing the optical zone diameter and increasing the overall lens
diameter will both tighten and steepen the relationship of the lens to
the cornea. Decreasing the optic zone diameter will serve to flatten
and loosen the lens to cornea relationship. Using a prism-ballasted
lens design will not affect the lens to cornea relationship as it relates
to sagittal depth.
5. A high minus rigid gas permeable lens will be thin centrally with
relatively thick edges. To reduce the edge thickness, and increase overall
comfort, use:
A. Aspheric peripheral curves
B. A myoflange
C. A higher Dk material
D. A hyperflange - ANSWER- The answer is D.
, 4|Page
A hyperflange will decrease edge thickness as well as lens awareness
. Aspheric peripheral curves change the posterior design of the lens
but do not reduce edge thickness. A higher Dk material will not
change the overall lens edge thickness. A myoflange will actually
add thickness to the lens edge and is used for high plus lenses not
high minus lenses.
6. To add minus power to a rigid contact lens with a rotating modifying
spindle, one would:
A. Polish the posterior surface of the rigid lens
B. Polish the mid peripheral anterior surface
C. Polish the central anterior surface
D. Polish the peripheral anterior surface - ANSWER- The answer is C.
One would rarely polish or attempt to manipulate the central
posterior surface of a rigid lens. Applying polishing pressure to the
mid-peripheral and the peripheral anterior surface would add plus
power. Applying polishing pressure to the central anterior surface
would add minus power.
7. Which lens design would provide the best visual acuity for a patient
with the following information?
K's 42.00@ 180/ 42.50@90
Rx -6.75 +1.75 cx 90
