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NCLE Exam Prep Questions and Answers 100% Solved
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NCLE Exam Prep Questions and Answers 100% Solved
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NCLE Exam Prep Questions and Answers 100% Solvedthe plastic, the smaller the angle the greater the wetting ability
toric lenses or toroid lenses -Answer lenses with different radii of curvature in each
meridian
which are used to correct astigmatism
principal meridians -Answer the meridians of shortest and longest radii which differ by 90
degrees
front surface toric lens -Answer 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 -Answer a lens in which both the posterior and anterior surfaces contain two
different radii
lenticular bowl -Answer 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 -Answer 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 -Answer clearness; visual ________ is measured by the smallest object that can be
seen at a certain distance
adnexa oculi -Answer accessory structures of the eye, such as the lacrimal appatatus and
the
eyelids
albinism -Answer heredetary loss of pigment in the eye, skin, hair, usually associated with
lowered visual acuity, nystagmus and light sensitivity
amblyopia -Answer loss of vision without any apparent disease of the eye
ametropia -Answer 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
optic zone -Answer the central portion of a contact lens which contains the refractive
power
and generally corresponds to the central corneal cap
,posterior apecal radius -Answer 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 -Answer occurs when the posterior radius of curvature is decreased (i.e.
8.4 to 8.1 mm)
flatter base curve -Answer occurs when the posterior radius of curvature is increased
(i.e.8.1
to 8.4 mm)
bicurve lens -Answer 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 -Answer 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 -Answer contains a base curve and three or more peripheral curves.
usually
a larger lens.
junctional zone -Answer the junction of two curves
blending -Answer 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 one
edge of the lens to the opposite edge
curve widths -Answer the width of the CPC, PPC, or IPC
central thickness -Answer separation between the anterior and posterior surface at the
geometric center of the lens. minus lenses are thinner, plus lenses are thicker
ballasted lens -Answer lens with a heavier base which becomes oriented inferiorly or
downward when the lens is worn
prism ballated lens -Answer a ballasted lens which utilizes a prism wedge designed to
weight
the lens
truncated lens -Answer a lens which has been cut off, usually 0.5-1.5 mm along its lower
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