, Correct the imbalance in the following prescription by use of slab-off. Reading level is 10
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mm:
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OD +5.00 -2.00 x 090
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OS +2.25 -3.00 x 090 - (correct answer) -2.25 prism BU in OS
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You are fitting a patient with a stock frame, 24 DBL, 44 eve size and 137 mm skull
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temples. The distance PD is only 62 mm. If by some unfortunate error the lenses are not
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decentered at all, how much prism is created in each eye?
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RX: OU -2.25 -1.50 x 045 - (correct answer) -0.5 prism BI
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A situation where the frame front is somewhat twisted, with the planes of the two lenses
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being out of line with one another, is called: - (correct answer) -Skewed bridge
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When a frame is said to have a parabolic curve (or positive face form), the following
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condition is meant: - (correct answer) -The bridge of the frame is out further than then
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end pieces
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If the lenses of a patient wearing -8.00 spheres are brought closer or his/her eyes, what
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if any effect will this have on the lenses? - (correct answer) -Increase minus power
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effect
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Slab-off is ground on the lens that has the _____in the 090 meridian: - (correct answer) -
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Weaker plus ui
Which of the following areas is not a factor in determining vertical imbalance? - (correct
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answer) -Add power
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A lens dispersing white light into its component colors is an example of : - (correct
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answer) -Chromatic aberration
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The lens aberration that produces a shorter focal length for rays near the edge of the
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lens than rays near the optical axis is called: - (correct answer) -Spherical aberration
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The aberration affecting image shape when wearing high minus lenses is called: -
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(correct answer) -barrel distortion
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What type of prismatic effect is easiest to tolerate at the near point? - (correct answer) -
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Base in ui
You can eliminate the effects of pantoscopic angle by: - (correct answer) -Raising the
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optical center by 1/2 the amount of tilt
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1 base up ad 2 base in for a left eye would be found in which quadrant? - (correct
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answer) -II
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