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NCLE EXAM, PRACTICE EXAM AND STUDY GUIDE LATEST 2025/2026 ACTUAL
EXAM CONTAINS 350 QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (VERIFIED ANSWERS) |ALREADY GRADED A+
Enzyme cleaner - ANSWER - a cleaning agent that acts on a soft lens by a digestion of
protein.
Epithelial edema - ANSWER - edema of the superficial layer of the cornea.
Esthesiometer (Cochet-Bonnet) - ANSWER - a device used to evaluate corneal sensitivity,
consisting essentially of a nylon thread mounted in a handle so that its length may be
varied and calibrated in milligrams of weight necessary to bend a given length of the thread
when pressed against the cornea.
Eversion of the eyelid - ANSWER - the folding back of the eyelid on itself.
Finished lens - ANSWER - a complete lens with anterior and posterior curves, a specified
diameter, a designated peripheral curve, and edge design.
Flare - ANSWER - fluttering or fringing of lights caused by a lens with an optic zone too
small as a decentered lens or an excessively loose lens.
Flat cornea - ANSWER - a cornea with a K value less than 41.00 D.
Fluid lens - ANSWER - power created by having a very convex or concave tear film.
Fluorescein - ANSWER - an organic compound that is inert and used to stain the tear film
for contact lens fitting and to assess the integrity of the cornea.
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Floro-silicone Acrylate (FSA) - ANSWER - an oxygen permeable contact lens material
consisting of fluorine (provides stability wettability and oxygen transmission) silicone
(oxygen transmission) and methyl methacrylate (stability durability optical quality and
machinability)
Focal Length - ANSWER - The distance from the vertex of an optical surface to its focal
point the reciprocal of the focal length is the power
Focal Point - ANSWER - The point along the principal axis of an optical surface where
incident parallel light will be focused after being converged or diverged by the surface
Focus - ANSWER - The point along the principal axis of an optical surface that light
converges to or diverges away from after encountering that surface
Front Toric - ANSWER - A lens design with two principal curves at right angles to each other
on the lens anterior
Front Vertex Power - ANSWER - Power of the lens when oriented so that light enters the
posterior surface and exits the anterior surface Measured with the front surface against the
lens stop of a lens meter
Giant papillary conjunctivitis (GPC) - ANSWER - large, elevated papules in the tarsal
conjunctiva. Usually associated with soft lens wear.
Haptic - ANSWER - the part of a contact or intraocular lens that supports the optic portion
and touches the peripheral or nonpoetic portion of the cornea: the word indicates
"fastening, contact, sense of touch."
HEMA - ANSWER - A hydrogel lens material; a polymer made up of repeating hydroxyethyl
methacrylate monomer units.
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Homopolymer - ANSWER - A polymer in which all monomer units are the same
Hydrogel - ANSWER - A polymer that absorbs and binds water into its molecular structure
Hydrophilic - ANSWER - water-loving
Hyperfine - ANSWER - A plus lenticular carrier
Hypoxia - ANSWER - low in oxygen.
Image - ANSWER - An optical reproduction of an object by a lens or mirror. REAL images
are formed where converging light focuses, and VIRTUAL images are formed where
diverging light focuses
Index of Refraction - ANSWER - The ratio of the speed of light in a vacuum (or air) to the
speed in another medium indicating the medium's refractive ability
Infinity (optical) - ANSWER - The distance light waves must travel from a source to lose all
curvature and be essentially parallel This distance is twenty feet
Intermediate Peripheral Curve (IPC) - ANSWER - A posterior curve that is flatter than the
secondary curve but steeper than the posterior peripheral curve (PPC)
K Readings - ANSWER - Also K's The measurement of the curvature of the central cornea as
measured by the Keratometer
Keratitis - ANSWER - inflammation of the cornea.
NCLE EXAM, PRACTICE EXAM AND STUDY GUIDE LATEST 2025/2026 ACTUAL
EXAM CONTAINS 350 QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (VERIFIED ANSWERS) |ALREADY GRADED A+
Enzyme cleaner - ANSWER - a cleaning agent that acts on a soft lens by a digestion of
protein.
Epithelial edema - ANSWER - edema of the superficial layer of the cornea.
Esthesiometer (Cochet-Bonnet) - ANSWER - a device used to evaluate corneal sensitivity,
consisting essentially of a nylon thread mounted in a handle so that its length may be
varied and calibrated in milligrams of weight necessary to bend a given length of the thread
when pressed against the cornea.
Eversion of the eyelid - ANSWER - the folding back of the eyelid on itself.
Finished lens - ANSWER - a complete lens with anterior and posterior curves, a specified
diameter, a designated peripheral curve, and edge design.
Flare - ANSWER - fluttering or fringing of lights caused by a lens with an optic zone too
small as a decentered lens or an excessively loose lens.
Flat cornea - ANSWER - a cornea with a K value less than 41.00 D.
Fluid lens - ANSWER - power created by having a very convex or concave tear film.
Fluorescein - ANSWER - an organic compound that is inert and used to stain the tear film
for contact lens fitting and to assess the integrity of the cornea.
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Floro-silicone Acrylate (FSA) - ANSWER - an oxygen permeable contact lens material
consisting of fluorine (provides stability wettability and oxygen transmission) silicone
(oxygen transmission) and methyl methacrylate (stability durability optical quality and
machinability)
Focal Length - ANSWER - The distance from the vertex of an optical surface to its focal
point the reciprocal of the focal length is the power
Focal Point - ANSWER - The point along the principal axis of an optical surface where
incident parallel light will be focused after being converged or diverged by the surface
Focus - ANSWER - The point along the principal axis of an optical surface that light
converges to or diverges away from after encountering that surface
Front Toric - ANSWER - A lens design with two principal curves at right angles to each other
on the lens anterior
Front Vertex Power - ANSWER - Power of the lens when oriented so that light enters the
posterior surface and exits the anterior surface Measured with the front surface against the
lens stop of a lens meter
Giant papillary conjunctivitis (GPC) - ANSWER - large, elevated papules in the tarsal
conjunctiva. Usually associated with soft lens wear.
Haptic - ANSWER - the part of a contact or intraocular lens that supports the optic portion
and touches the peripheral or nonpoetic portion of the cornea: the word indicates
"fastening, contact, sense of touch."
HEMA - ANSWER - A hydrogel lens material; a polymer made up of repeating hydroxyethyl
methacrylate monomer units.
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Homopolymer - ANSWER - A polymer in which all monomer units are the same
Hydrogel - ANSWER - A polymer that absorbs and binds water into its molecular structure
Hydrophilic - ANSWER - water-loving
Hyperfine - ANSWER - A plus lenticular carrier
Hypoxia - ANSWER - low in oxygen.
Image - ANSWER - An optical reproduction of an object by a lens or mirror. REAL images
are formed where converging light focuses, and VIRTUAL images are formed where
diverging light focuses
Index of Refraction - ANSWER - The ratio of the speed of light in a vacuum (or air) to the
speed in another medium indicating the medium's refractive ability
Infinity (optical) - ANSWER - The distance light waves must travel from a source to lose all
curvature and be essentially parallel This distance is twenty feet
Intermediate Peripheral Curve (IPC) - ANSWER - A posterior curve that is flatter than the
secondary curve but steeper than the posterior peripheral curve (PPC)
K Readings - ANSWER - Also K's The measurement of the curvature of the central cornea as
measured by the Keratometer
Keratitis - ANSWER - inflammation of the cornea.
