NCLE Advanced Certification EXAM Questions &
Correct Answers | Verified | 2027
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Terms in this set (459)
1. The sagittal depth of a rigid The answer is D.
gas permeable contact lens can
be altered without changing the The posterior optical zone will directly affect the
diameter by: lens to cornea relationship of a rigid gas
permeable lens. If the posterior optical zone is
A. Changing the power steepened, it will increase the sagittal depth. If it is
B. Changing the edge design flattened, it will decrease the sagittal depth.
Changing the power, which is accomplished by
C. Changing the radius of
changing the anterior optical zone, will not affect
curvature of the anterior optical
the sagittal depth of the lens, nor will changing its
zone
edge design.
D. Changing the radius of
curvature of the posterior optical
zone
2. A truncation is used on a rigid The answer is A.
gas permeable contact lens to
help enhance the performance of A lens is truncated by removing a segment of the
which type of design? lower edge of a contact lens. This creates a straight
edge that interacts with the lower lid and aids in
A. Bifocal lens positioning. Of the lens designs listed in the
B. Aphakic question, the only one that requires precise
positioning of its optical portions is a translating
C. Bitoric
bifocal lens.
D. Keratoconus
,3. The mass of an aphakic rigid The answer is B.
gas permeable contact lens can
be reduced by making the lens A lenticular or myoflange design will decrease the
design: mass of an aphakic lens as well as increase the
edge profile, which allows it to interact more with
A. Spherical the upper lid and aid in positioning of the lens.
B. Lenticular
C. Tricurve
D. Aspheric
4. In order to tighten the fit of a The answer is B.
rigid gas permeable lens you can:
I. Increase the optical zone Increasing the optical zone diameter and increasing
diameter the overall lens diameter will both tighten and
2. Decrease the optical zone steepen the relationship of the lens to the cornea.
diameter Decreasing the optic zone diameter will serve to
3. Increase the overall lens flatten and loosen the lens to cornea relationship.
Using a prism-ballasted lens design will not affect
diameter
the lens to cornea relationship as it relates to
4. Use a prism ballasted lens
sagittal depth.
design
A. 3 only
B. 1&3
C. 2 only
D. 2&3
,5. A high minus rigid gas The answer is D.
permeable lens will be thin
centrally with relatively thick A hyperflange will decrease edge thickness as well
edges. To reduce the edge as lens awareness . Aspheric peripheral curves
thickness, and increase overall change the posterior design of the lens but do not
comfort, use: reduce edge thickness. A higher Dk material will not
change the overall lens edge thickness. A
A. Aspheric peripheral curves myoflange will actually add thickness to the lens
edge and is used for high plus lenses not high
B. A myoflange
minus lenses.
C. A higher Dk material
D. A hyperflange
6. To add minus power to a rigid The answer is C.
contact lens with a rotating
modifying spindle, one would: One would rarely polish or attempt to manipulate
the central posterior surface of a rigid lens.
A. Polish the posterior surface of Applying polishing pressure to the mid-peripheral
the rigid lens and the peripheral anterior surface would add plus
B. Polish the mid peripheral power. Applying polishing pressure to the central
anterior surface would add minus power.
anterior surface
C. Polish the central anterior
surface
D. Polish the peripheral anterior
surface
, 7. Which lens design would The answer is A.
provide the best visual acuity for
a patient with the following The keratometer readings indicate the need for a
information? spherical back surface, which would rule out the
K's 42.00@ 180/ 42.50@90 use of a bitoric lens. A soft spherical lens would not
Rx -6.75 +1.75 cx 90 correct the moderate amount of refractive
astigmatism that is present, nor would the spherical
A. Front surface toric rigid gas rigid gas permeable lens. A front surface toric RGP
would best meet this patient's needs since it has a
permeable
spherical back surface, but has a toric front surface
B. Spherical rigid gas permeable
which would correct the residual astigmatism.
C. Soft sphere
D. Bitoric rigid gas permeable
8. Which of the following The answer is A.
describes the angle that the edge
of a bead of water makes with The wetting angle of a rigid gas permeable
the surface of a plastic? material describes how a fluid spreads over the
surface. It is important to remember, however, that
A. Wetting angle wetting angle is a description of the material
B. Surface angle outside of the patient's natural ocular environment.
C. Bead angle Within minutes of insertion, a rigid lens is
encapsulated in the natural tear mucin and the
D. Reflection angle
wetting angle of the material is no longer important.
Correct Answers | Verified | 2027
Save
Terms in this set (459)
1. The sagittal depth of a rigid The answer is D.
gas permeable contact lens can
be altered without changing the The posterior optical zone will directly affect the
diameter by: lens to cornea relationship of a rigid gas
permeable lens. If the posterior optical zone is
A. Changing the power steepened, it will increase the sagittal depth. If it is
B. Changing the edge design flattened, it will decrease the sagittal depth.
Changing the power, which is accomplished by
C. Changing the radius of
changing the anterior optical zone, will not affect
curvature of the anterior optical
the sagittal depth of the lens, nor will changing its
zone
edge design.
D. Changing the radius of
curvature of the posterior optical
zone
2. A truncation is used on a rigid The answer is A.
gas permeable contact lens to
help enhance the performance of A lens is truncated by removing a segment of the
which type of design? lower edge of a contact lens. This creates a straight
edge that interacts with the lower lid and aids in
A. Bifocal lens positioning. Of the lens designs listed in the
B. Aphakic question, the only one that requires precise
positioning of its optical portions is a translating
C. Bitoric
bifocal lens.
D. Keratoconus
,3. The mass of an aphakic rigid The answer is B.
gas permeable contact lens can
be reduced by making the lens A lenticular or myoflange design will decrease the
design: mass of an aphakic lens as well as increase the
edge profile, which allows it to interact more with
A. Spherical the upper lid and aid in positioning of the lens.
B. Lenticular
C. Tricurve
D. Aspheric
4. In order to tighten the fit of a The answer is B.
rigid gas permeable lens you can:
I. Increase the optical zone Increasing the optical zone diameter and increasing
diameter the overall lens diameter will both tighten and
2. Decrease the optical zone steepen the relationship of the lens to the cornea.
diameter Decreasing the optic zone diameter will serve to
3. Increase the overall lens flatten and loosen the lens to cornea relationship.
Using a prism-ballasted lens design will not affect
diameter
the lens to cornea relationship as it relates to
4. Use a prism ballasted lens
sagittal depth.
design
A. 3 only
B. 1&3
C. 2 only
D. 2&3
,5. A high minus rigid gas The answer is D.
permeable lens will be thin
centrally with relatively thick A hyperflange will decrease edge thickness as well
edges. To reduce the edge as lens awareness . Aspheric peripheral curves
thickness, and increase overall change the posterior design of the lens but do not
comfort, use: reduce edge thickness. A higher Dk material will not
change the overall lens edge thickness. A
A. Aspheric peripheral curves myoflange will actually add thickness to the lens
edge and is used for high plus lenses not high
B. A myoflange
minus lenses.
C. A higher Dk material
D. A hyperflange
6. To add minus power to a rigid The answer is C.
contact lens with a rotating
modifying spindle, one would: One would rarely polish or attempt to manipulate
the central posterior surface of a rigid lens.
A. Polish the posterior surface of Applying polishing pressure to the mid-peripheral
the rigid lens and the peripheral anterior surface would add plus
B. Polish the mid peripheral power. Applying polishing pressure to the central
anterior surface would add minus power.
anterior surface
C. Polish the central anterior
surface
D. Polish the peripheral anterior
surface
, 7. Which lens design would The answer is A.
provide the best visual acuity for
a patient with the following The keratometer readings indicate the need for a
information? spherical back surface, which would rule out the
K's 42.00@ 180/ 42.50@90 use of a bitoric lens. A soft spherical lens would not
Rx -6.75 +1.75 cx 90 correct the moderate amount of refractive
astigmatism that is present, nor would the spherical
A. Front surface toric rigid gas rigid gas permeable lens. A front surface toric RGP
would best meet this patient's needs since it has a
permeable
spherical back surface, but has a toric front surface
B. Spherical rigid gas permeable
which would correct the residual astigmatism.
C. Soft sphere
D. Bitoric rigid gas permeable
8. Which of the following The answer is A.
describes the angle that the edge
of a bead of water makes with The wetting angle of a rigid gas permeable
the surface of a plastic? material describes how a fluid spreads over the
surface. It is important to remember, however, that
A. Wetting angle wetting angle is a description of the material
B. Surface angle outside of the patient's natural ocular environment.
C. Bead angle Within minutes of insertion, a rigid lens is
encapsulated in the natural tear mucin and the
D. Reflection angle
wetting angle of the material is no longer important.
