NCLE Practical 2025 COMPREHENSIVE EXAM QUESTIONS
NCLE Practice
|FREQUENTLY TESTED QUESTIONS |RECENTLY TESTING REAL EXA
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QUESTIONS|VERIFIED SOLUTIONS (100% CORRECT)
1. base curve refers to the radius of curvature of the central posterior surface of the lens. It may
be expressed in diopters of surface power (D) or in millimeters (mm) of radius or
curvature.
2. optical zone the chord diameter over which the base curve extends on the posterior surface of
the contact lens, described in millimeters
3. secondary or lies between the base curve and the peripheral curve on the posterior lens surface,
intermediate usually 0.70mm to 1.50mm flatter than the base curve radius, this allows the lens
curves to better align the flatter portion of the cornea adjacent to the optical zone
4. peripheral curve the outermost curve on the posterior lens surface, its function is to clear the flatter
periphery of the cornea and to prevent lens impingement in the limbal areas as
the lens moves with blinking
5. blend curve the treatment given to the sharp junctions created by the difference in the radii of
curvature between the base curve, the secondary curve, and the peripheral curve,
rarely required at the base curve/secondary curve junction.
6. lens diameter refers to the overall width of the lens from one edge to the other, it is measured
in millimeters. Normal ranges are from 7.00mm to 10.50mm in rigid lenses and
from 12.50mm to 16.00mm in soft contacts
7. center thickness the measurement in millimeters from the anterior to the posterior surface of the
lens at its geometric center, this measurement varies significantly depending on
the power of the lens
8. anterior nearer the front, especially situated in the front of the body or nearer to the head
9. posterior further back in position; of or nearer the rear or hind end, especially of the body
or a part of it.
10. lens power the difference between the radii of the anterior and posterior lens surface
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11. abrasion rubbing off of the superficial layer
12. accommodation adjustment by the eye for seeing different distances, accomplished by changing
the shape of the crystalline lens through action of the ciliary muscle
13. acuity clearness; measured by the smallest object that can seen at a certain distance
14. adnexa oculi accessory structures of the eye, such as lacrimal apparatus and the eye lids
15. albinism hereditary loss of pigment in the eye, skin & hair; usually associated with lowered
visual acuity, nystagmus & light sensitivity
16. amblyopia loss of vision with any apparent disease of the eye
17. ametropia a refractive error in which the eye, when in state of rest, does not focus the image
of an object upon the retina; includes hyperopia,myopia and astigmatism
18. aniridia congenital absence of the iris
19. aniseikonia a condition in which the ocular image of an object as seen by one eye differs so
much in size or shape from the seen by the other eye that the two images cannot
be fused into a single impression
20. aniscoria inequality of the pupils in diameter
21. anomaly departure from the normal
22. anopthalmia absence of a true eyeball
23.
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anterior cham- space in front of the eye, bounded in front by the cornea and behind by the iris;
ber filled with aqueous humor
24. antibody a specific substance produced by the body in the presence of an antigen
25. antigen any substance that acts against the action of histamine
26. aphakia absence of the crystalline lens of the eye
27. aqueous humor clear, watery fluid that fills the anterior and posterior chambers within the front
part of the eye
28. arcus senilus grayish white ring in the periphery of the cornea
29. asthenopia eye fatigue caused by tiring of the internal and/or external muscles
30. astigmatism a refractive error that prevents light rays from coming to a single focus on the
retina because of different degrees of refraction in the various meridians of the
eye
31. against-the-rule condition in which the steepest corneal meridian is in the horizontal plane. An
astigmatism example of keratometer readings for a patient exhibiting this condition would be:
K's 45.00@180/42.00@90
32. irregular astig- astigmatism caused by an irregularly shaped cornea
matism
33. astigmatism found in the crystalline lens
NCLE Practice
|FREQUENTLY TESTED QUESTIONS |RECENTLY TESTING REAL EXA
Study online at https://quizlet.com/_1dlr1m
QUESTIONS|VERIFIED SOLUTIONS (100% CORRECT)
1. base curve refers to the radius of curvature of the central posterior surface of the lens. It may
be expressed in diopters of surface power (D) or in millimeters (mm) of radius or
curvature.
2. optical zone the chord diameter over which the base curve extends on the posterior surface of
the contact lens, described in millimeters
3. secondary or lies between the base curve and the peripheral curve on the posterior lens surface,
intermediate usually 0.70mm to 1.50mm flatter than the base curve radius, this allows the lens
curves to better align the flatter portion of the cornea adjacent to the optical zone
4. peripheral curve the outermost curve on the posterior lens surface, its function is to clear the flatter
periphery of the cornea and to prevent lens impingement in the limbal areas as
the lens moves with blinking
5. blend curve the treatment given to the sharp junctions created by the difference in the radii of
curvature between the base curve, the secondary curve, and the peripheral curve,
rarely required at the base curve/secondary curve junction.
6. lens diameter refers to the overall width of the lens from one edge to the other, it is measured
in millimeters. Normal ranges are from 7.00mm to 10.50mm in rigid lenses and
from 12.50mm to 16.00mm in soft contacts
7. center thickness the measurement in millimeters from the anterior to the posterior surface of the
lens at its geometric center, this measurement varies significantly depending on
the power of the lens
8. anterior nearer the front, especially situated in the front of the body or nearer to the head
9. posterior further back in position; of or nearer the rear or hind end, especially of the body
or a part of it.
10. lens power the difference between the radii of the anterior and posterior lens surface
, NCLE Practice
Study online at https://quizlet.com/_1dlr1m
11. abrasion rubbing off of the superficial layer
12. accommodation adjustment by the eye for seeing different distances, accomplished by changing
the shape of the crystalline lens through action of the ciliary muscle
13. acuity clearness; measured by the smallest object that can seen at a certain distance
14. adnexa oculi accessory structures of the eye, such as lacrimal apparatus and the eye lids
15. albinism hereditary loss of pigment in the eye, skin & hair; usually associated with lowered
visual acuity, nystagmus & light sensitivity
16. amblyopia loss of vision with any apparent disease of the eye
17. ametropia a refractive error in which the eye, when in state of rest, does not focus the image
of an object upon the retina; includes hyperopia,myopia and astigmatism
18. aniridia congenital absence of the iris
19. aniseikonia a condition in which the ocular image of an object as seen by one eye differs so
much in size or shape from the seen by the other eye that the two images cannot
be fused into a single impression
20. aniscoria inequality of the pupils in diameter
21. anomaly departure from the normal
22. anopthalmia absence of a true eyeball
23.
, NCLE Practice
Study online at https://quizlet.com/_1dlr1m
anterior cham- space in front of the eye, bounded in front by the cornea and behind by the iris;
ber filled with aqueous humor
24. antibody a specific substance produced by the body in the presence of an antigen
25. antigen any substance that acts against the action of histamine
26. aphakia absence of the crystalline lens of the eye
27. aqueous humor clear, watery fluid that fills the anterior and posterior chambers within the front
part of the eye
28. arcus senilus grayish white ring in the periphery of the cornea
29. asthenopia eye fatigue caused by tiring of the internal and/or external muscles
30. astigmatism a refractive error that prevents light rays from coming to a single focus on the
retina because of different degrees of refraction in the various meridians of the
eye
31. against-the-rule condition in which the steepest corneal meridian is in the horizontal plane. An
astigmatism example of keratometer readings for a patient exhibiting this condition would be:
K's 45.00@180/42.00@90
32. irregular astig- astigmatism caused by an irregularly shaped cornea
matism
33. astigmatism found in the crystalline lens
