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NCLE ADVANCED CERTIFICATION EXAM
2025 UPDATED ACTUAL EXAM WITH
CORRECT SOLUTIONS.
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. - correct answer- 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
The answer is A.
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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. -
correct answer- 2. A truncation is used on a rigid gas
permeable contact lens to help enhance the performance of
which type of design?
A. Bifocal
B. Aphakic
C. Bitoric
D. Keratoconus
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. - correct answer- 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
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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. - correct
answer- 4. In order to tighten the fit of a rigid gas permeable
lens you can:
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
The answer is D.
A hyperflange will decrease edge thickness as well as lens
awareness . Aspheric peripheral curves change the posterior
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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. - correct
answer- 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
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. - correct answer- 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
NCLE ADVANCED CERTIFICATION EXAM
2025 UPDATED ACTUAL EXAM WITH
CORRECT SOLUTIONS.
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. - correct answer- 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
The answer is A.
,2 | Page
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. -
correct answer- 2. A truncation is used on a rigid gas
permeable contact lens to help enhance the performance of
which type of design?
A. Bifocal
B. Aphakic
C. Bitoric
D. Keratoconus
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. - correct answer- 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
,3 | Page
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. - correct
answer- 4. In order to tighten the fit of a rigid gas permeable
lens you can:
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
The answer is D.
A hyperflange will decrease edge thickness as well as lens
awareness . Aspheric peripheral curves change the posterior
, 4 | Page
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. - correct
answer- 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
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. - correct answer- 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
