NCLE | WITH VERIFIED ACCURATE ANSWERS |
LATEST UPDATED
annular bifocal contact - Answers -A lens with distance portion ground into the center of
the lens and the near portion ground into the periphery
aphakic lenses - Answers -lenses designed for post-cataract fitting
apical zone of cornea - Answers -the central portion of the cornea with a constant
radius of curvature. Also called the corneal cap.
artificial tears - Answers -medications, many of them over the counter, to treat dry eyes
aspheric lens - Answers -A non-spherical lens, in which the radii of curvature increase
towards the periphery rather than remaining equal at all points. Aspheric lenses reduce
optical aberration and improve resolution.
bactericide - Answers -a chemical that disinfects and kills pathogenic organisms.
benzalkonium chloride - Answers -a preservative used in contact lens solutions
because of its germicidal qualities
biomicroscopy - Answers -Ophthalmic examination of the eye by use of a slit lamp and
a magnifying lens; also known as a slit-lamp exam. 10 to 50 times magnification
bullous keratopathy - Answers -corneal edema with painful blisters in the epithelium
due to corneal endothelial dysfunction. treated frequently with a therapeutic soft lens.
Burton lamp - Answers -an ultraviolet light used to illuminate the fluorescein dye that is
used to analyze the fit of a rigid contact lens.
chord length - Answers -the straight-line measurement of the contact. lens diameter
from edge to edge.
circumcorneal injection - Answers -Redness around the limbus surrounding the cornea
contact lens wetting angle - Answers -the angle between the liquid and the lens
surface.
contour lens - Answers -a tricurve lens designed to conform to the curvature of the
cornea, which flattens as it extends in the periphery.
copolymer - Answers -two or more chemicals that are combined to form a new
chemical compound.
,corneal cap - Answers -Apical zone or central zone of the cornea that has a constant
area of curvature.
corneal diameter - Answers -the diameter of the cornea, usually taken along the
horizontal meridian with a ruler. Also called visible iris diameter.
corneal edema - Answers -swelling of the cornea caused by hypoxia or insufficient
oxygen
deturgence, corneal - Answers -the state of relative dehydration maintain by the normal
intact cornea that enables it to remain transparent
diagnostic fitting set - Answers -a set of trial lenses used to gain an overview of the fit
of a contact lens.
disinfection - Answers -physical or chemical procedures that kill common pathogenic
organisms but may permit some nonpathogenic organisms to survive.
DK value - Answers -a measure of the oxygen permeability through a given material
where D is the diffusion coefficient for oxygen movement in the lens material and K is
the solubility of oxygen in this material.
double slab-off lenses - Answers -sometimes called thick-thin lenses; the upper and
lower portions of the lens are reduced in thickness so that when the lens is placed on
the eye these portions lie under the upper and lower eyelids. The thin zones aid in
stabilizing toric soft lenses.
dry spots - Answers -areas of drying as noted by absent areas of fluorescein-stained
tear film on the cornea when the patient stares.
Dyer nomogram system of lens ordering - Answers -a simplified system of ordering
rigid lenses based on clinical experience, corneal topogometry and charts of associated
lens parameters.
endophthalmitis - Answers -an inflammation of the entire eye including the outer coats.
enzyme cleaner - Answers -a cleaning agent that acts on a soft lens by a digestion of
protein.
epithelial edema - Answers -edema of the superficial layer of the cornea.
Esthesiometer (Cochet-Bonnet) - Answers -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 - Answers -the folding back of the eyelid on itself.
finished lens - Answers -a complete lens with anterior and posterior curves, a specified
diameter, a designated peripheral curve, and edge design.
fitting set - Answers -a complete inventory of lenses of graduated powers and base
curves.
flare - Answers -flutterings or fringing of lights caused by a lens with an optic zone too
small as a decentered lens or an excessively loose lens.
Fluorescein - Answers -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.
Giant Papillary Conjunctivitis - Answers -A condition associated with contact lens wear,
especially soft lens wear, marked by increasing lens awareness, itching, mucous
discharge, forming of coating on contact lens, and large elevated papillae
haptic - Answers -The part of a contact or intraocular lens that supports the optic
portion and touches the peripheral or non optic portion of the cornea: the word indicated
"fastening, contact, sense of touch."
HVID - Answers -Horizontal visible iris diameter
hydrogen peroxide - Answers -a bactericide used for soft lenses
hypoxia - Answers -deficiency in the amount of oxygen reaching the tissues
keratitis - Answers -inflammation of the cornea
keratoconjunctivitis sicca - Answers -dryness of the cornea and conjunctiva resulting
from a decrease in lacrimal function
keratoplasty - Answers -corneal transplant
LD+2 - Answers -the longest diameter(LD) of the optic zone plus 2 mm (for the
intermediate and peripheral curves) yields the diameter of a lens; determined by use of
the topogometer
lenticular lens - Answers -relatively large lens most suitable for large, flat eyes; consists
of a central optic zone and a surrounding nonoptic flange.
limbal zone - Answers -junction between the periphery of the cornea with the sclera
LATEST UPDATED
annular bifocal contact - Answers -A lens with distance portion ground into the center of
the lens and the near portion ground into the periphery
aphakic lenses - Answers -lenses designed for post-cataract fitting
apical zone of cornea - Answers -the central portion of the cornea with a constant
radius of curvature. Also called the corneal cap.
artificial tears - Answers -medications, many of them over the counter, to treat dry eyes
aspheric lens - Answers -A non-spherical lens, in which the radii of curvature increase
towards the periphery rather than remaining equal at all points. Aspheric lenses reduce
optical aberration and improve resolution.
bactericide - Answers -a chemical that disinfects and kills pathogenic organisms.
benzalkonium chloride - Answers -a preservative used in contact lens solutions
because of its germicidal qualities
biomicroscopy - Answers -Ophthalmic examination of the eye by use of a slit lamp and
a magnifying lens; also known as a slit-lamp exam. 10 to 50 times magnification
bullous keratopathy - Answers -corneal edema with painful blisters in the epithelium
due to corneal endothelial dysfunction. treated frequently with a therapeutic soft lens.
Burton lamp - Answers -an ultraviolet light used to illuminate the fluorescein dye that is
used to analyze the fit of a rigid contact lens.
chord length - Answers -the straight-line measurement of the contact. lens diameter
from edge to edge.
circumcorneal injection - Answers -Redness around the limbus surrounding the cornea
contact lens wetting angle - Answers -the angle between the liquid and the lens
surface.
contour lens - Answers -a tricurve lens designed to conform to the curvature of the
cornea, which flattens as it extends in the periphery.
copolymer - Answers -two or more chemicals that are combined to form a new
chemical compound.
,corneal cap - Answers -Apical zone or central zone of the cornea that has a constant
area of curvature.
corneal diameter - Answers -the diameter of the cornea, usually taken along the
horizontal meridian with a ruler. Also called visible iris diameter.
corneal edema - Answers -swelling of the cornea caused by hypoxia or insufficient
oxygen
deturgence, corneal - Answers -the state of relative dehydration maintain by the normal
intact cornea that enables it to remain transparent
diagnostic fitting set - Answers -a set of trial lenses used to gain an overview of the fit
of a contact lens.
disinfection - Answers -physical or chemical procedures that kill common pathogenic
organisms but may permit some nonpathogenic organisms to survive.
DK value - Answers -a measure of the oxygen permeability through a given material
where D is the diffusion coefficient for oxygen movement in the lens material and K is
the solubility of oxygen in this material.
double slab-off lenses - Answers -sometimes called thick-thin lenses; the upper and
lower portions of the lens are reduced in thickness so that when the lens is placed on
the eye these portions lie under the upper and lower eyelids. The thin zones aid in
stabilizing toric soft lenses.
dry spots - Answers -areas of drying as noted by absent areas of fluorescein-stained
tear film on the cornea when the patient stares.
Dyer nomogram system of lens ordering - Answers -a simplified system of ordering
rigid lenses based on clinical experience, corneal topogometry and charts of associated
lens parameters.
endophthalmitis - Answers -an inflammation of the entire eye including the outer coats.
enzyme cleaner - Answers -a cleaning agent that acts on a soft lens by a digestion of
protein.
epithelial edema - Answers -edema of the superficial layer of the cornea.
Esthesiometer (Cochet-Bonnet) - Answers -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 - Answers -the folding back of the eyelid on itself.
finished lens - Answers -a complete lens with anterior and posterior curves, a specified
diameter, a designated peripheral curve, and edge design.
fitting set - Answers -a complete inventory of lenses of graduated powers and base
curves.
flare - Answers -flutterings or fringing of lights caused by a lens with an optic zone too
small as a decentered lens or an excessively loose lens.
Fluorescein - Answers -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.
Giant Papillary Conjunctivitis - Answers -A condition associated with contact lens wear,
especially soft lens wear, marked by increasing lens awareness, itching, mucous
discharge, forming of coating on contact lens, and large elevated papillae
haptic - Answers -The part of a contact or intraocular lens that supports the optic
portion and touches the peripheral or non optic portion of the cornea: the word indicated
"fastening, contact, sense of touch."
HVID - Answers -Horizontal visible iris diameter
hydrogen peroxide - Answers -a bactericide used for soft lenses
hypoxia - Answers -deficiency in the amount of oxygen reaching the tissues
keratitis - Answers -inflammation of the cornea
keratoconjunctivitis sicca - Answers -dryness of the cornea and conjunctiva resulting
from a decrease in lacrimal function
keratoplasty - Answers -corneal transplant
LD+2 - Answers -the longest diameter(LD) of the optic zone plus 2 mm (for the
intermediate and peripheral curves) yields the diameter of a lens; determined by use of
the topogometer
lenticular lens - Answers -relatively large lens most suitable for large, flat eyes; consists
of a central optic zone and a surrounding nonoptic flange.
limbal zone - Answers -junction between the periphery of the cornea with the sclera
