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NAO VOLUME 3 exam/105 Q’S AND A’S
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NAO VOLUME 3 exam/105 Q’S ANDA’S
The correct transposed RX for -1.00-.50x37 is? - --1.50 + 0.50 x 127
-The correct transposition for +2.00 -2.00 x 060 is? - -Plano +2.00 x 150
-An uncut lens must be at least _______ mm in diameter to allow the edging
of a 54 mm round lens decentered 3 mm in: - -60 mm
-A +3.00 sphere lens has a front base curve of +6.25. What is the back
surface curve? - --3.25
-A -2.00 -1.00 x 045 lens has a front base curve of +6.25. What are the back
surface curves? - --8.25 -1.00
-Moving the optical center of a plus lens inward from the correct PD results
in _____ - -Base in prism
-Where will the optical center appear in a lensometer when neutralizing a
left lens for base in prism? - -To the left of the target center
-Glazing is a term used to indicate _____ - -A defect that occurs when an
anti-reflective lens is tinted
-Frequently, bicentric grinding (slab-off) is used as a means of obtaining
prism in the reading field to correct induced prism imbalance. The usual
correction during the fabrication process is achieved by grinding prism in the
following direction: - -up
-A patient stops in to see you for adjustment of his glasses. After careful
inspection you find the only thing wrong that there is too much pantoscopic
tilt. To make the necessary adjustment you will: - -Angle the temples
upward from the end pieces
-If the RX is +2.00 -4.00 x 135, it would be necessary to decenter the lens
_____to create 1.00 prism base in : - -not possible
-Rewrite the RX below, which is prescribed for a patient afflicted with double
vision, so as to make better balanced lenses:
OD -1.00 -0.50 x 090 5.00 BU
OS -1.25 - 0.50 x 090 1.00 BD - -OD -1.00 -0.50 x 090 3.00 prism BU
OS -1.25 -0.50x 090 3.00 prism BD
, -Correct the imbalance in the following prescription by use of slab-off.
Reading level is 10 mm:
OD +5.00 -2.00 x 090
OS +2.25 -3.00 x 090 - -2.25 prism BU in OS
-You are fitting a patient with a stock frame, 24 DBL, 44 eve size and 137
mm skull temples. The distance PD 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: OU -2.25 -1.50 x 045 - -0.5 prism BI
-A situation where the frame front is somewhat twisted, with the planes of
the two lenses being out of line with one another, is called: - -Skewed bridge
-When a frame is said to have a parabolic curve (or positive face form), the
following condition is meant: - -The bridge of the frame is out further than
then end pieces
-If the lenses of a patient wearing -8.00 spheres are brought closer or his/her
eyes, what if any effect will this have on the lenses? - -Increase minus power
effect
-Slab-off is ground on the lens that has the _____in the 090 meridian: - -
Weaker plus
-Which of the following areas is not a factor in determining vertical
imbalance? - -Add power
-A lens dispersing white light into its component colors is an example of : - -
Chromatic aberration
-The lens aberration that produces a shorter focal length for rays near the
edge of the lens than rays near the optical axis is called: - -Spherical
aberration
-The aberration affecting image shape when wearing high minus lenses is
called: - -barrel distortion
-What type of prismatic effect is easiest to tolerate at the near point? - -
Base in
-You can eliminate the effects of pantoscopic angle by: - -Raising the optical
center by 1/2 the amount of tilt
-1 base up ad 2 base in for a left eye would be found in which quadrant? - -II
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