OTI NCLE Prep Course UPDATED Actual Exam Questions and CORRECT Answers
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Course
OTI NCLE
Institution
OTI NCLE
OTI NCLE Prep Course UPDATED Actual
Exam Questions and CORRECT Answers
Optic Zone - CORRECT ANSWER- Central portion of a contact lens which contains the
refractive power (generally corresponds to the corneal cap)
Posterior Apecal Radius - CORRECT ANSWER- Spin-cast soft lenses. (Curvature of
...
OTI NCLE Prep Course UPDATED Actual
Exam Questions and CORRECT Answers
Optic Zone - CORRECT ANSWER✔✔- Central portion of a contact lens which contains the
refractive power (generally corresponds to the corneal cap)
Posterior Apecal Radius - CORRECT ANSWER✔✔- Spin-cast soft lenses. (Curvature of
posterior surface changes with refractive power. Measured at apex of posterior surface)
Steeper Base Curve - CORRECT ANSWER✔✔- As the Posterior radius of curvature is
decreased the base curve becomes: (i.e. 8.4-8.1)
Flatter Base Curve - CORRECT ANSWER✔✔- As the Posterior radius of curvature is
increased the base curve becomes: (i.e. 8.1-8.4)
Bicurve Lens - CORRECT ANSWER✔✔- Contact lens with two curves; a primary base
curve and a flatter peripheral curve
Tricurve Lens - CORRECT ANSWER✔✔- Contact lens with three curves; base curve, outer
peripheral posterior curve (PPC), and intermediate posterior curve (IPC)
Multicurve Lens - CORRECT ANSWER✔✔- Contains base curve and three or more
peripheral curves
Junction Zone - CORRECT ANSWER✔✔- Junction of two curves
Blending - CORRECT ANSWER✔✔- The smoothing of a junction zone by removing the
sharp line between the zones
Lens Diameter or Chord Diameter - CORRECT ANSWER✔✔- Measurement from one edge
to the other
, Central Thickness - CORRECT 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 - CORRECT ANSWER✔✔- Lens with a heavier base which becomes
oriented inferiorly (downward) when the lens is worn
Prism Ballasted Lens - CORRECT ANSWER✔✔- A ballasted lens which utilizes a prism
wedge designed to weight the lens
Truncated Lens - CORRECT ANSWER✔✔- A lens which had been cut off to form a
horizontal base (usually 0.5-1.5mm along lower edge)
Back Surface Power - CORRECT ANSWER✔✔- Effective power of a lens when measured
from the back surface
Wetting Angle - CORRECT ANSWER✔✔- The angle that the edge of a bead of water makes
with the surface of the plastic (smaller angle = greater wetting)
Toric Lenses - CORRECT ANSWER✔✔- Lenses with different radii of curvature in each
meridian; used to correct astigmatism
Principal Meridians - CORRECT ANSWER✔✔- The meridians of the shortest and longest
radii which differ by 90 degrees
Front Surface Toric Lens - CORRECT ANSWER✔✔- A lens in which the anterior surface
had two different radii and the posterior surface is spherical
Back Surface Toric Lens - CORRECT ANSWER✔✔- A lens in which the posterior surface
has two different radii and the anterior surface is spherical
Bitoric Lens - CORRECT ANSWER✔✔- A lens in which both the posterior and anterior
surfaces contain two different radii
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