NAO VOLUME 3 study guide questions with complete solution
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Course
NAO
Institution
NAO
The correct transposed RX for -1.00-.50x37 is? - correct answer -1.50 + 0.50 x 127
The correct transposition for +2.00 -2.00 x 060 is? - correct 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: - correct...
NAO VOLUME 3 study guide questions with complete
solution
The correct transposed RX for -1.00-.50x37 is? - correct answer -1.50 + 0.50 x 127
The correct transposition for +2.00 -2.00 x 060 is? - correct 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: - correct answer 60 mm
A +3.00 sphere lens has a front base curve of +6.25. What is the back surface
curve? - correct 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? - correct answer -8.25 -1.00
Moving the optical center of a plus lens inward from the correct PD results in
_____ - correct answer Base in prism
Where will the optical center appear in a lensometer when neutralizing a left lens
for base in prism? - correct answer To the left of the target center
Glazing is a term used to indicate _____ - correct 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: -
correct 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: - correct 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 : - correct 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 - correct 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 - correct answer 2.25 prism BU in OS
, NAO VOLUME 3 study guide questions with complete
solution
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 - correct 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: - correct answer Skewed
bridge
When a frame is said to have a parabolic curve (or positive face form), the
following condition is meant: - correct 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? - correct answer Increase minus
power effect
Slab-off is ground on the lens that has the _____in the 090 meridian: - correct
answer Weaker plus
Which of the following areas is not a factor in determining vertical imbalance? -
correct answer Add power
A lens dispersing white light into its component colors is an example of : - correct
answer 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: - correct answer Spherical
aberration
The aberration affecting image shape when wearing high minus lenses is called: -
correct answer barrel distortion
What type of prismatic effect is easiest to tolerate at the near point? - correct
answer Base in
You can eliminate the effects of pantoscopic angle by: - correct answer 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? - correct
answer II
2 base down and 2 base out for left eye would be found in which quadrant? -
correct answer IV
3 base out and 5 base down for a right eye would be found in which quadrant? -
correct answer III
3 base down and 2 base in for a left eye would be found in which quadrant? -
correct answer I
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