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NCLE EXAM PREP 2024| 540 EXAM QUESTIONS WITH 100% CORRECT SOLUTIONWERS SCORED A+
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NCLE EXAM PREP 2024| 540 EXAM QUESTIONS WITH 100% CORRECT SOLUTIONWERS SCORED A+
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NCLE EXAM PREP 2024| 540 EXAM QUESTIONSWITH 100% CORRECT SOLUTIONWERS SCORED
A+
optic zone <CORRECT ANS> the central portion of a contact lens which contains the refractive
power
and generally corresponds to the central corneal cap
posterior apecal radius <CORRECT SOLUTION> this term is generally used in reference to spin-
cast soft lenses. the curvature of the posterior surface of the lens changes with the refractive
power. theradius of curvature is measured at the apex of the posterior surface.
steeper base curve <CORRECT SOLUTION> occurs when the posterior radius of curvature is
decreased (i.e.8.4 to 8.1 mm)
flatter base curve <CORRECT SOLUTION> occurs when the posterior radius of curvature is
increased (i.e.8.1to 8.4 mm)
bicurve lens <CORRECT SOLUTION> a contact lens which contains two curves: one base curve
and one secondary curve. it is usually small 7.5 to 8.8 mm on diameter, relatively steep and
made with narrow peripheral curves about 0.2 mm. lenses are usually intrapalpebral lenses,
designed to fitwithin the palpebral fissure limits.
tricurve lens <CORRECT SOLUTION> a contact lens which contains three curves: a base curve, an
outer peripheral posterior curve (PPC), and an intermediate posterior curve (IPC). lenses are
generallylarger, 9.5 mm or greater.
multicurve lens <CORRECT SOLUTION> contains a base curve and three or more peripheral
curves. usuallya larger lens.
junctional zone <CORRECT SOLUTION> the junction of two curves
blending <CORRECT SOLUTION> the smoothing of a junctional zone by removing the sharp line
betweenthe zones
,lens diameter or chord diameter -Answer✅ the width of a lens or the measurement from one
edge of the lens to the opposite edge
curve widths <CORRECT SOLUTION> the width of the CPC, PPC, or IPC
central thickness <CORRECT SOLUTION> separation between the anterior and posterior surface at
thegeometric center of the lens. minus lenses are thinner, plus lenses are thicker
ballasted lens <CORRECT SOLUTION> lens with a heavier base which becomes oriented inferiorly
ordownward when the lens is worn
prism ballated lens <CORRECT SOLUTION> a ballasted lens which utilizes a prism wedge designed
to weightthe lens
truncated lens <CORRECT SOLUTION> a lens which has been cut off, usually 0.5-1.5 mm along
its lower edge, to form a horizontal base. double along the top and bottom portion of the lens
is sometimes done to help improve stabilization
back surface power <CORRECT SOLUTION> effective power of a lens when measured from the
back surface
wetting angle <CORRECT SOLUTION> the angle that the edge of a bead of water makes with the
surface ofthe plastic, the smaller the angle the greater the wetting ability
toric lenses or toroid lenses <CORRECT SOLUTION> lenses with different radii of curvature in each
meridianwhich are used to correct astigmatism
principal meridians <CORRECT SOLUTION> the meridians of shortest and longest radii which
differ by 90degrees
front surface toric lens <CORRECT SOLUTION> a lens in which the anterior surface has two
different radiiand the posterior surface is spherical
,back surface toric lens -Answer✅ a lens in which the posterior surface has two different radii
and the anterior surface is spherical
bitoric lens <CORRECT SOLUTION> a lens in which both the posterior and anterior surfaces
contain twodifferent radii
lenticular bowl <CORRECT SOLUTION> a lens design generally used in higher plus power which
consists of acentral optic zone and a surrounding non-optic peripheral or "carrier" portion
spin-cast soft lens <CORRECT SOLUTION> a mentioned of manufacturing soft contact lenses
whereby a liquid material is revolved in a mold at a controlled speed and temperature which
produces thedesired curvature, design, and power
acuity <CORRECT SOLUTION> clearness; visual is measured by the smallest object that
can beseen at a certain distance
adnexa oculi <CORRECT SOLUTION> accessory structures of the eye, such as the lacrimal
appatatus and theeyelids
albinism <CORRECT SOLUTION> heredetary loss of pigment in the eye, skin, hair, usually
associated withlowered visual acuity, nystagmus and light sensitivity
amblyopia <CORRECT SOLUTION> loss of vision without any apparent disease of the eye
ametropia <CORRECT SOLUTION> a refractive error in which the eye, when in a state of rest,
does not focusthe image of an object upon the retina; includes hyperopia, myopia, and
astigmatism. see also refractive error
aniridia <CORRECT SOLUTION> congenital absence of the iris
, aniseikonia -Answer✅ a condition in which the ocular image of an object as seen by one eye
differs so much in size or shape from that seen by the other eye that the two images cannot be
focused into a single impression
aniscoria <CORRECT SOLUTION> inequality of the pupils in diameter
anomaly <CORRECT SOLUTION> departure from the normal
anophthalmia <CORRECT SOLUTION> absence of a true eyeball
anterior chamber <CORRECT SOLUTION> space in front of the eye, bounded in front by the
cornea andbehind by the iris; filled with aqueous humor
antibody <CORRECT SOLUTION> a specific substance produced by the body in the presence of an
antigen
antigen <CORRECT SOLUTION> any substance that acts against the action of histamine
antihistamine <CORRECT SOLUTION> a substance that acts against the action of histamine
aphakia <CORRECT SOLUTION> absence of the crystalline lens of the eye
aqueous humor <CORRECT SOLUTION> clear, watery fluid that fills the anterior and posterior
chamberswithin the front part of the eye
arcus senilus <CORRECT SOLUTION> grayish white ring in the periphery of the cornea
asthenopia <CORRECT SOLUTION> eye fatigue caused by tiring of the internal and/or external
muscles
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