NCLE ADVANCED CERTIFICATION EXAM |ACTUAL
QUESTIONS AND VERIFIED ANSWERS|BRAND NEW
2026-2027 UPDATE|GRADED A+
Question 1
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
CORRECT 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.
Question 2
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
1
,D. Keratoconus
CORRECT 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.
Question 3
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
CORRECT 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.
Question 4
4. In order to tighten the fit of a rigid gas permeable lens you can:
I. Increase the optical zone diameter
2
,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
CORRECT 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.
Question 5
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
CORRECT ANSWER
The answer is D.
3
, 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.
Question 6
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
CORRECT 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.
Question 7
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
4
QUESTIONS AND VERIFIED ANSWERS|BRAND NEW
2026-2027 UPDATE|GRADED A+
Question 1
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
CORRECT 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.
Question 2
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
1
,D. Keratoconus
CORRECT 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.
Question 3
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
CORRECT 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.
Question 4
4. In order to tighten the fit of a rigid gas permeable lens you can:
I. Increase the optical zone diameter
2
,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
CORRECT 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.
Question 5
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
CORRECT ANSWER
The answer is D.
3
, 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.
Question 6
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
CORRECT 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.
Question 7
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
4
