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NAO VOLUME 3: Questions With Well Detailed Answers
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NAO VOLUME 3: Questions With Well Detailed Answers
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NAO VOLUME 3: Questions With Well Detailed AnswersThe correct transposed RX for -1.00-.50x37 is? Right Ans - -1.50 + 0.50 x
127
The correct transposition for +2.00 -2.00 x 060 is? Right Ans - 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: Right Ans - 60 mm
A +3.00 sphere lens has a front base curve of +6.25. What is the back surface
curve? Right Ans - -3.25
A -2.00 -1.00 x 045 lens has a front base curve of +6.25. What are the back
surface curves? Right Ans - -8.25 -1.00
Moving the optical center of a plus lens inward from the correct PD results in
_____ Right Ans - Base in prism
Where will the optical center appear in a lensometer when neutralizing a left
lens for base in prism? Right Ans - To the left of the target center
Glazing is a term used to indicate _____ Right Ans - 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: Right Ans - 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: Right Ans - 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 : Right Ans - 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 Right Ans - 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 Right Ans - 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 Right Ans - 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: Right Ans - Skewed
bridge
When a frame is said to have a parabolic curve (or positive face form), the
following condition is meant: Right Ans - 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? Right Ans - Increase
minus power effect
Slab-off is ground on the lens that has the _____in the 090 meridian: Right
Ans - Weaker plus
Which of the following areas is not a factor in determining vertical imbalance?
Right Ans - Add power
A lens dispersing white light into its component colors is an example of :
Right Ans - Chromatic aberration
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