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NCLE FINAL EXAM PREP 2024/500+ QUESTIONS AND CORRECT VERIIED ANSWERS LATEST UPDATE
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NCLE FINAL EXAM PREP 2024/500+ QUESTIONS AND CORRECT VERIIED ANSWERS LATEST UPDATE
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NCLE FINAL EXAM PREP 2024/500+ QUESTIONS ANDCORRECT VERIIED ANSWERS LATEST UPDATE 2024-
2025
Optic zone -FEEDBACK:->>the central portion of a contact lens which contains the
refractive power and generally corresponds to the central corneal cap
Posterior apical radius -FEEDBACK:->>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 -FEEDBACK:->>occurs when the posterior radius of curvature
is decreased (i.e. 8.4 to 8.1 mm)
flatter base curve -FEEDBACK:->>occurs when the posterior radius of curvature is
increased (i.e.8.1 to 8.4 mm)
bicurve lens -FEEDBACK:->>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 -FEEDBACK:->>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 -FEEDBACK:->>contains a base curve and three or more
peripheral curves. usually a larger lens.
junctional zone -FEEDBACK:->>the junction of two curves
blending -FEEDBACK:->>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 -FEEDBACK:->>the width of the CPC, PPC, or IPC
central thickness -FEEDBACK:->>separation between the anterior and posterior
surface at the geometric center of the lens. minus lenses are thinner, plus lenses are
thicker
ballasted lens -FEEDBACK:->>lens with a heavier base which becomes oriented
inferiorly or downward when the lens is worn
,prism ballated lens -FEEDBACK:->>a ballasted lens which utilizes a prism wedge
designed to weight the lens
truncated lens -FEEDBACK:->>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 -FEEDBACK:->>effective power of a lens when measured from
the back surface
wetting angle -FEEDBACK:->>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 -FEEDBACK:->>lenses with different radii of curvature
in each meridian which are used to correct astigmatism
principal meridians -FEEDBACK:->>the meridians of shortest and longest radii
which differ by 90 degrees
front surface toric lens -FEEDBACK:->>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 -FEEDBACK:->>a lens in which both the posterior and anterior surfaces
contain two different radii
lenticular bowl -FEEDBACK:->>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 -FEEDBACK:->>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 -FEEDBACK:->>clearness; visual is measured by the smallest object
that can be seen at a certain distance
adnexa oculi -FEEDBACK:->>accessory structures of the eye, such as the lacrimal
appatatus and the eyelids
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