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