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NCLE EXAM PREP 2024| 540 EXAM QUESTIONS WITH 100% CORRECT ANSWERS GRADED A+
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NCLE EXAM PREP 2024| 540 EXAM QUESTIONS WITH 100% CORRECT ANSWERS GRADED A+
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NCLE EXAM PREP 2024| 540 EXAM QUESTIONSWITH 100% CORRECT ANSWERS GRADED 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 <RIGHT CHOICE> 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. the
radius of curvature is measured at the apex of the posterior surface.
steeper base curve <RIGHT CHOICE> occurs when the posterior radius of curvature is decreased
(i.e.8.4 to 8.1 mm)
flatter base curve <RIGHT CHOICE> occurs when the posterior radius of curvature is increased
(i.e.8.1to 8.4 mm)
bicurve lens <RIGHT CHOICE> 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 fit
within the palpebral fissure limits.
tricurve lens <RIGHT CHOICE> a contact lens which contains three curves: a base curve, an outer
peripheral posterior curve (PPC), and an intermediate posterior curve (IPC). lenses are generally
larger, 9.5 mm or greater.
multicurve lens <RIGHT CHOICE> contains a base curve and three or more peripheral curves.
usuallya larger lens.
junctional zone <RIGHT CHOICE> the junction of two curves
blending <RIGHT CHOICE> 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 <RIGHT CHOICE> the width of the CPC, PPC, or IPC
central thickness <RIGHT CHOICE> separation between the anterior and posterior surface at the
geometric center of the lens. minus lenses are thinner, plus lenses are thicker
ballasted lens <RIGHT CHOICE> lens with a heavier base which becomes oriented inferiorly or
downward when the lens is worn
prism ballated lens <RIGHT CHOICE> a ballasted lens which utilizes a prism wedge designed to
weightthe lens
truncated lens <RIGHT CHOICE> 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 <RIGHT CHOICE> effective power of a lens when measured from the back
surface
wetting angle <RIGHT CHOICE> 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 <RIGHT CHOICE> lenses with different radii of curvature in each
meridianwhich are used to correct astigmatism
principal meridians <RIGHT CHOICE> the meridians of shortest and longest radii which differ by
90degrees
front surface toric lens <RIGHT CHOICE> 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 <RIGHT CHOICE> a lens in which both the posterior and anterior surfaces contain two
different radii
lenticular bowl <RIGHT CHOICE> 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 <RIGHT CHOICE> 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 <RIGHT CHOICE> clearness; visual is measured by the smallest object that can be
seen at a certain distance
adnexa oculi <RIGHT CHOICE> accessory structures of the eye, such as the lacrimal appatatus and
theeyelids
albinism <RIGHT CHOICE> heredetary loss of pigment in the eye, skin, hair, usually associated
withlowered visual acuity, nystagmus and light sensitivity
amblyopia <RIGHT CHOICE> loss of vision without any apparent disease of the eye
ametropia <RIGHT CHOICE> 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 <RIGHT CHOICE> 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 <RIGHT CHOICE> inequality of the pupils in diameter
anomaly <RIGHT CHOICE> departure from the normal
anophthalmia <RIGHT CHOICE> absence of a true eyeball
anterior chamber <RIGHT CHOICE> space in front of the eye, bounded in front by the cornea and
behind by the iris; filled with aqueous humor
antibody <RIGHT CHOICE> a specific substance produced by the body in the presence of an
antigen
antigen <RIGHT CHOICE> any substance that acts against the action of histamine
antihistamine <RIGHT CHOICE> a substance that acts against the action of histamine
aphakia <RIGHT CHOICE> absence of the crystalline lens of the eye
aqueous humor <RIGHT CHOICE> clear, watery fluid that fills the anterior and posterior chambers
within the front part of the eye
arcus senilus <RIGHT CHOICE> grayish white ring in the periphery of the cornea
asthenopia <RIGHT CHOICE> eye fatigue caused by tiring of the internal and/or external muscles
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