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NCLE EXAM PREP 2024| 540 EXAM QUESTIONS AND CORRECT ANSWERS RATED A+
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NCLE EXAM PREP 2024| 540 EXAM QUESTIONS AND CORRECT ANSWERS RATED A+
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NCLE EXAM PREP 2024| 540 EXAM QUESTIONS ANDCORRECT ANSWERS RATED 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 ANS> 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 <CORRECT ANS> occurs when the posterior radius of curvature is
decreased (i.e. 8.4 to 8.1 mm)
flatter base curve <CORRECT ANS> occurs when the posterior radius of curvature is increased
(i.e.8.1 to 8.4 mm)
bicurve lens <CORRECT ANS> 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 <CORRECT ANS> 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 <CORRECT ANS> contains a base curve and three or more peripheral curves.
usually a larger lens.
junctional zone <CORRECT ANS> the junction of two curves
blending <CORRECT ANS> the smoothing of a junctional zone by removing the sharp line
between the zones
, lens diameter or chord diameter -Answer✅ the width of a lens or the measurement from
oneof the lens to the opposite edge
edge
curve widths <CORRECT ANS> the width of the CPC, PPC, or IPC
central thickness <CORRECT ANS> separation between the anterior and posterior surface at
the geometric center of the lens. minus lenses are thinner, plus lenses are thicker
ballasted lens <CORRECT ANS> lens with a heavier base which becomes oriented inferiorly or
downward when the lens is worn
prism ballated lens <CORRECT ANS> a ballasted lens which utilizes a prism wedge designed to
weight the lens
truncated lens <CORRECT ANS> 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 ANS> effective power of a lens when measured from the back
surface
wetting angle <CORRECT ANS> the angle that the edge of a bead of water makes with the
surface of the plastic, the smaller the angle the greater the wetting ability
toric lenses or toroid lenses <CORRECT ANS> lenses with different radii of curvature in each
meridian which are used to correct astigmatism
principal meridians <CORRECT ANS> the meridians of shortest and longest radii which differ
by 90 degrees
front surface toric lens <CORRECT ANS> a lens in which the anterior surface has two
different radii and 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 ANS> a lens in which both the posterior and anterior surfaces contain
two different radii
lenticular bowl <CORRECT ANS> a lens design generally used in higher plus power which
consists of a central optic zone and a surrounding non-optic peripheral or "carrier" portion
spin-cast soft lens <CORRECT ANS> a mentioned of manufacturing soft contact lenses
whereby a liquid material is revolved in a mold at a controlled speed and temperature which
produces the desired curvature, design, and power
acuity <CORRECT ANS> clearness; visual is measured by the smallest object that can
be seen at a certain distance
adnexa oculi <CORRECT ANS> accessory structures of the eye, such as the lacrimal appatatus
and the eyelids
albinism <CORRECT ANS> heredetary loss of pigment in the eye, skin, hair, usually associated
with lowered visual acuity, nystagmus and light sensitivity
amblyopia <CORRECT ANS> loss of vision without any apparent disease of the eye
ametropia <CORRECT ANS> 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.
see also refractive error
aniridia <CORRECT ANS> congenital absence of the iris
, aniseikonia -Answer✅ a condition in which the ocular image of an object as seen by one
eye so much in size or shape from that seen by the other eye that the two images cannot be
differs
focused into a single impression
aniscoria <CORRECT ANS> inequality of the pupils in diameter
anomaly <CORRECT ANS> departure from the normal
anophthalmia <CORRECT ANS> absence of a true eyeball
anterior chamber <CORRECT ANS> space in front of the eye, bounded in front by the cornea
and behind by the iris; filled with aqueous humor
antibody <CORRECT ANS> a specific substance produced by the body in the presence of an
antigen
antigen <CORRECT ANS> any substance that acts against the action of histamine
antihistamine <CORRECT ANS> a substance that acts against the action of histamine
aphakia <CORRECT ANS> absence of the crystalline lens of the eye
aqueous humor <CORRECT ANS> clear, watery fluid that fills the anterior and posterior
chambers within the front part of the eye
arcus senilus <CORRECT ANS> grayish white ring in the periphery of the cornea
asthenopia <CORRECT ANS> eye fatigue caused by tiring of the internal and/or external
muscles
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