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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

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Uploaded on August 28, 2024
Number of pages 140
Written in 2024/2025
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Contains Questions & answers

ncle final exam prep 2024500 questions and corr

Institution NCLE PREP
Course NCLE PREP

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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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