NAO VOLUME 3 PRACTICE EXAM QUESTIONS AND 100% CORRECT ANSWERS.
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Course
NAO
Institution
NAO
The correct transposed RX for -1.00-.50x37 is? - Answer -1.50 + 0.50 x 127
The correct transposition for +2.00 -2.00 x 060 is? - Answer 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: - Answer 60 mm...
NAO VOLUME 3 PRACTICE EXAM
QUESTIONS AND 100% CORRECT
ANSWERS.
The correct transposed RX for -1.00-.50x37 is? - Answer -1.50 + 0.50 x 127
The correct transposition for +2.00 -2.00 x 060 is? - Answer 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: - Answer 60 mm
A +3.00 sphere lens has a front base curve of +6.25. What is the back surface curve? - Answer -3.25
A -2.00 -1.00 x 045 lens has a front base curve of +6.25. What are the back surface curves? - Answer -
8.25 -1.00
Moving the optical center of a plus lens inward from the correct PD results in _____ - Answer Base in
prism
Where will the optical center appear in a lensometer when neutralizing a left lens for base in prism? -
Answer To the left of the target center
Glazing is a term used to indicate _____ - Answer 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: - Answer 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: - Answer
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 : - Answer 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 - Answer 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 - Answer 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 - Answer 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: - Answer Skewed bridge
When a frame is said to have a parabolic curve (or positive face form), the following condition is meant: -
Answer 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? - Answer Increase minus power effect
Slab-off is ground on the lens that has the _____in the 090 meridian: - Answer Weaker plus
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