ABO NCLE CONTACT LENS TERMS EXAM QUESTIONS AND
ABO NCLE Contact Lens Terms
ANSWERS || LATEST 2025/2026 || A GRADE
Study online at https://quizlet.com/_gw3apc
1. Abrasion, scraped area of corneal surface, accompanied by loss of superficial tissue (ep-
Corneal ithelium)
2. Acanthamoeba A rare, but serious sight-destroying inflammation of the cornea caused by the
keratitis parasite fount in contaminated water
3. accommodation the ability of the crystalline lens to adjust power to provide retinal focus of images
closer than optical infinity
4. Add Additional amount of plus power required for focusing at near
5. Albinism congenital absence or deficiency of pigment in the iris, skin, and/or hair; usually
associated with lowered visual acuity, nystagmus, and photophobia and often
accompanied by large refractive errors
6. ambloypia Loss of vision without any apparent disease of the eye
7. ametropia A refractive error in which the eye, when in a state of rest, does not focus the image
of an object upon the retina; includes hyperopia, myopia, and astigmatism.
8. anomaly deviation from what is normal
9. Anterior Bev- Angulation applied to the anterior surface of a lens to reduce edge Thickness
el/CN Bevel
10. Anterior Optical Diameter of the anterior power curve
Zone (AOZ)
11. aphakia Absence of the crystalline lens
12. Apical (apex) The extreme top or tip of a curve, e.g. corneal apex.
13. Apical bearing, The posterior lens curvature resting on the corneal apex.
apical touch
, ABO NCLE Contact Lens Terms
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14. aqueous humor clear, watery fluid that fills the space between the back corneal surface and
the front vitreous surface, bathing the crystalline lens. Produced by the ciliary
processes; nourishes the cornea, iris, and lens and maintains intraocular pressure
15. Aqueous tears The middle layer of the tear film. The watery component of the tears
16. Arbor A brass tool that holds a lens or lens blank in place for cutting the surface or
polishing
17. Arcuate stain An arc shaped corneal abrasion caused by the edge of a contact lens
18. Aspheric Not spherical. A posterior or anterior lens surface design which flattens at a given
rate (eccentricity) as the curve progresses toward the periphery.
19. Aspheric lens a lens that resembles an ellipse, parabola, or other conic section rather than a
sphere. It can be designed to improve the fit and comfort of a lens by paralleling
the cornea more closely or to provide progressive bifocal effect
20. astigmatism defective curvature of the cornea or lens of the eye
21. Axial edge lift Vertical distance from the lens edge to an extension of the base curve of a lens.
22. Axis, cylinder The weakest, or least curved, meridian on the surface of a cylindrical or toric
surface.
23. Axis, principal An imaginary line going through the geometric center of an optical system,
perpendicular to the surface.
24. Back toric A lens design with two principal curves at right angles to each other on the lens
posterior
25. Back Vertex Pow- the power of the lens when it is oriented such as when light enters the anterior
er (BVP) surface and exits the posterior surface. It is when the lens is positioned with the
back curve (concave) is position against the lens the lens stop of a lensometer
, ABO NCLE Contact Lens Terms
Study online at https://quizlet.com/_gw3apc
26. Bandage lens Soft contact lens used for protecting damaged or irregular corneal surfaces.
27. Base curve of a contact lens, the curvature of the posterior optical portion, otherwise known
as the Central Posterior Curve (C.P.C)
28. Bell's phenome- Upward and outward deviation of the eyes occurring in sleep or with forcible
non closure of the eyelids.
29. benzyl alcohol A disinfectant and preservative in rigid lens solutions
30. Bicurve lens A lens consisting of two posterior curvatures; one central curve (base curve) and
one peripheral curve.
31. binocular Referring to or affecting both eyes
32. Bitoric A lens design with two principal curves at right angles to each other on both the
anterior and posterior lens surfaces
33. Blends The junctures between posterior curves after being smoothed out by polishing.
34. blepharitis inflammation of the eyelids, usually with redness, swelling, and itching
35. blepharoplasty any plastic surgery of the eyelids, e.g, removal of the excessive lid skin or subcu-
(BLEF-ah-roh-plas-tee)
taneous fat
36. bullous ker- Degenerative process characterized by small blister-like pockets that form in
atopathy swollen corneal epithelial layers; markedly reduces vision.
37. Break-up time Measurement of the time interval between a blink and the development of a dry
(B.U.T) spot in the pre-corneal tear film; less than 10 seconds is abnormal.
38. CAB (cellulose ac- A first generation, low Dk (4.0 Dk) gas permeable lens material.
etate butyrate)
39. cataract
ABO NCLE Contact Lens Terms
ANSWERS || LATEST 2025/2026 || A GRADE
Study online at https://quizlet.com/_gw3apc
1. Abrasion, scraped area of corneal surface, accompanied by loss of superficial tissue (ep-
Corneal ithelium)
2. Acanthamoeba A rare, but serious sight-destroying inflammation of the cornea caused by the
keratitis parasite fount in contaminated water
3. accommodation the ability of the crystalline lens to adjust power to provide retinal focus of images
closer than optical infinity
4. Add Additional amount of plus power required for focusing at near
5. Albinism congenital absence or deficiency of pigment in the iris, skin, and/or hair; usually
associated with lowered visual acuity, nystagmus, and photophobia and often
accompanied by large refractive errors
6. ambloypia Loss of vision without any apparent disease of the eye
7. ametropia A refractive error in which the eye, when in a state of rest, does not focus the image
of an object upon the retina; includes hyperopia, myopia, and astigmatism.
8. anomaly deviation from what is normal
9. Anterior Bev- Angulation applied to the anterior surface of a lens to reduce edge Thickness
el/CN Bevel
10. Anterior Optical Diameter of the anterior power curve
Zone (AOZ)
11. aphakia Absence of the crystalline lens
12. Apical (apex) The extreme top or tip of a curve, e.g. corneal apex.
13. Apical bearing, The posterior lens curvature resting on the corneal apex.
apical touch
, ABO NCLE Contact Lens Terms
Study online at https://quizlet.com/_gw3apc
14. aqueous humor clear, watery fluid that fills the space between the back corneal surface and
the front vitreous surface, bathing the crystalline lens. Produced by the ciliary
processes; nourishes the cornea, iris, and lens and maintains intraocular pressure
15. Aqueous tears The middle layer of the tear film. The watery component of the tears
16. Arbor A brass tool that holds a lens or lens blank in place for cutting the surface or
polishing
17. Arcuate stain An arc shaped corneal abrasion caused by the edge of a contact lens
18. Aspheric Not spherical. A posterior or anterior lens surface design which flattens at a given
rate (eccentricity) as the curve progresses toward the periphery.
19. Aspheric lens a lens that resembles an ellipse, parabola, or other conic section rather than a
sphere. It can be designed to improve the fit and comfort of a lens by paralleling
the cornea more closely or to provide progressive bifocal effect
20. astigmatism defective curvature of the cornea or lens of the eye
21. Axial edge lift Vertical distance from the lens edge to an extension of the base curve of a lens.
22. Axis, cylinder The weakest, or least curved, meridian on the surface of a cylindrical or toric
surface.
23. Axis, principal An imaginary line going through the geometric center of an optical system,
perpendicular to the surface.
24. Back toric A lens design with two principal curves at right angles to each other on the lens
posterior
25. Back Vertex Pow- the power of the lens when it is oriented such as when light enters the anterior
er (BVP) surface and exits the posterior surface. It is when the lens is positioned with the
back curve (concave) is position against the lens the lens stop of a lensometer
, ABO NCLE Contact Lens Terms
Study online at https://quizlet.com/_gw3apc
26. Bandage lens Soft contact lens used for protecting damaged or irregular corneal surfaces.
27. Base curve of a contact lens, the curvature of the posterior optical portion, otherwise known
as the Central Posterior Curve (C.P.C)
28. Bell's phenome- Upward and outward deviation of the eyes occurring in sleep or with forcible
non closure of the eyelids.
29. benzyl alcohol A disinfectant and preservative in rigid lens solutions
30. Bicurve lens A lens consisting of two posterior curvatures; one central curve (base curve) and
one peripheral curve.
31. binocular Referring to or affecting both eyes
32. Bitoric A lens design with two principal curves at right angles to each other on both the
anterior and posterior lens surfaces
33. Blends The junctures between posterior curves after being smoothed out by polishing.
34. blepharitis inflammation of the eyelids, usually with redness, swelling, and itching
35. blepharoplasty any plastic surgery of the eyelids, e.g, removal of the excessive lid skin or subcu-
(BLEF-ah-roh-plas-tee)
taneous fat
36. bullous ker- Degenerative process characterized by small blister-like pockets that form in
atopathy swollen corneal epithelial layers; markedly reduces vision.
37. Break-up time Measurement of the time interval between a blink and the development of a dry
(B.U.T) spot in the pre-corneal tear film; less than 10 seconds is abnormal.
38. CAB (cellulose ac- A first generation, low Dk (4.0 Dk) gas permeable lens material.
etate butyrate)
39. cataract
