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NCLE Practice Test Practical Exam/122 Questions and Answers
NCLE Practice Test Practical Exam/122 Questions and Answers
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NCLE Practice Test PracticalExam/122 Questions and Answers
Steep Fluorescein Pattern - -Bright green pooling center, very faint green
pooling on diameter of lens
-Flat Fluorescein Pattern - -Bright green pooling on diameter of lens, very
faint green in center
-Against-the-rule Astigmatism Pattern - -Bright green pooling horizontally,
faint green pooling vertically
-With-the-rule Astigmatism Pattern - -Bright green pooling vertically, faint
green pooling horizontally
-Prism Ballast - -Common technique to stabilize lens from rotating. Added
thickness will position lens inferiorly (bottom of cornea)
-Truncation - -Cutting off .50mm to 1.50mm of bottom edge of lens to
provide stability. Reduces diameter, making a looser fit.
-Double Slab-off - -Lens is thicker centrally and thinner at top and bottom of
lens. Provides comfort to wearer, but may cause some stability issues.
-Aspheric Lens Design - -
-Hyperflange - -Used to correct high riding minus lenses.
-Myoflange - -Used to correct low riding plus lenses.
-Monovision - -Corrects presbyopia in contact wearers. One eye uses
distance (dominant) and the other eye uses reading (resessive)
-Segment Bifocal - -Same concept as spectacle bifocal. Must be prism
ballast. Often crescent shaped.
-Toric Lenses - -Anterior (front surface), back spherical surface or posterior
(back surface), toric back curve
-Front Toric Lens - -Corrects a low to moderate amount of corneal
astigmatism
-Back Toric Lens - -Corrects a mid to high amount of corneal astigmatism
, -Bitoric Lens - -Corrects 1.50D of corneal astigmatism and high residual
astigmatism
-Aphakic - -Condition of no crystalline lens
-Psuedophakic - -Implant, intraocular lens
-Corneal Edema - -Always causes a poor fitting lens
-Spectacle Blur - -Temporary blurred vision upon switching from contact
lenses to eyeglasses
-Crystalline Lens - -The main focusing mechanism of the eye
-The Main Supply of Oxygen to the cornea is provided by - -Tear Film
-Keratometry mires which are only clear when the wearer blinks are
indicative of a - -Steep Fit
-Keratometry mires which blur immediately following blink are indicative of
a - -Flat Fit
-A rigid contact lens shows a flourescein pattern inferiorly and superiorly
beneath the lens. This is indicative of which type of astigmatism - -With-the-
rule
-A bi-toric rigid lens will show - -Two base curves on the radiuscope, sphero-
cylindrical rx on the lensometer
-The ANSI tolerance for a soft lens diameter is - -±0.25
-The ANSI tolerance for a soft lens refractive power on a Rx 5.12D to 10.00D
- -±0.18
-The ANSI tolerance for RGP Base Curve is - -±0.05mm
-The ANSI tolerance for RGP lens diameter is - -±0.05mm
-Which instrument allows simultaneous verification of lens diameter, optic
zone width, and peripheral curve - -Radiuscope
-Which instrument is best to observe the blends of rigid contact lens - -
Profile Analyzer
-If a toric lens rotates to the fitters left - -Add the degrees of rotation to the
prescribed axis
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