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12 Cards in this Set
- Front
- Back
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Given an Rx of:
Plano +1.00 x 090, when ground, the resulting lens is prescribed for which of the following conditions? A. Simple myopic astigmatism B. Simple hyperopia C. Simple hyperopic astigmatism D. Compound hyperopic astigmatism |
C. Simple hyperopic astigmatism
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If the pupillary distance is measured while the patient is focusing on a point 16 inches in front of his eyes, the P.D. measured is known as the _______ P.D.
A. Distance B. Intermediate C. Near D. Most accurate |
C. Near
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The optical cross is a graphic representation used to show the _________ of a lens.
A. Surface curvature B. Corrected curves C. Compensated vertex D. Meridian powers |
D. Meridian powers
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You are fitting a patient with a Titan-10 frame, 24 DBL, 44 eye size, and 5V2 inch skull temples. The distance P.D. is only 62 mm. If by some unfortunate error the lenses are NOT decentered at all, how much prism is created in each eye? Rx O.U.-2.25-1.50x45
A. 0.9 ^ B.I. B. 0.5 ^ B.I. C. 0.9 ^ B.O. D. 0.5 ^ B.O. |
A. 0.9 ^ B.I.
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A characteristic most single vision CR-39 lens series have in common is:
A. Plus cylinder form B. A square molded shape C. Minus cylinder form D. Minus base curves |
C. Minus cylinder form
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As the pantoscopic angle is increased:
A. The spherical equivalent is decreased B. The optical centers are effectively raised C. The spherical equivalent is increased D. The optical centers should be lowered |
C. The spherical equivalent is increased
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A lens of -2.00 +2.00 x 90 power corrects _______ .
A. Simple myopic astigmatism B. Simple hyperopic astigmatism C. Simple myopia D. Compound myopic astigmatism |
A. Simple myopic astigmatism
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The vertical difference in power between lenses in the following Rx is: O.D.-1.00 +0.50 x 045 O.S. -1.00 +0.50 x 090
A. 0.75D sph B. 0.50Dsph C. 0.25D sph D. No difference |
C. 0.25D sph
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A ptosis crutch is used to give support to:
A. Lower lid B. Upper lid C. Nasal bridge D. Nose pads |
B. Upper lid
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A patient comes in with a prescription requiring a large amount of plus power (+12.50 diopters) and with a notation Vertex Distance 12 mm. You find that when fitted with a frame, the lens will set 14 mm from his eye. What change will be necessary in the lens to be ordered?
A. More plus sphere power B. Less plus sphere power C. More minus cylinder power D. Less minus cylinder power |
B. Less plus sphere power
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If the lenses of a patient wearing -15.00 spheres are brought closer to his/her eyes, what if any effect will this have on the effective power?
A. Increase minus power effect B. Decrease minus power effect C. Cause prism base in effect D. Cause prism base out effect |
A. Increase minus power effect
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Most commonly, opticians use a Geneva lens measure to:
A. Measure lens thickness B. Measure segment height C. Measure lens diameter D. Measure lens base curve |
D. Measure lens base curve
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