NAO Volume 3 Questions & Answers 2026 |
Latest Review Guide
The correct transposed RX for -1.00-.50x37 is? - correct Answers-1.50 + 0.50 x 127
The correct transposition for +2.00 -2.00 x 060 is? - correct AnswersPlano +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 Answers60 mm
A +3.00 sphere lens has a front base curve of +6.25. What is the back surface curve? -
correct Answers-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 Answers-8.25 -1.00
Moving the optical center of a plus lens inward from the correct PD results in _____ -
correct AnswersBase in prism
Where will the optical center appear in a lensometer when neutralizing a left lens for
base in prism? - correct AnswersTo the left of the target center
Glazing is a term used to indicate _____ - correct AnswersA 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
Answersup
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 AnswersAngle 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 Answersnot 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 AnswersOD -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 Answers2.25 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 - correct Answers0.5 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 AnswersSkewed bridge
When a frame is said to have a parabolic curve (or positive face form), the following
condition is meant: - correct AnswersThe 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 AnswersIncrease minus power effect
Slab-off is ground on the lens that has the _____in the 090 meridian: - correct
AnswersWeaker plus
Which of the following areas is not a factor in determining vertical imbalance? - correct
AnswersAdd power
A lens dispersing white light into its component colors is an example of : - correct
AnswersChromatic 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 AnswersSpherical aberration
The aberration affecting image shape when wearing high minus lenses is called: -
correct Answersbarrel distortion
What type of prismatic effect is easiest to tolerate at the near point? - correct
AnswersBase in
You can eliminate the effects of pantoscopic angle by: - correct AnswersRaising 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
AnswersII
2 base down and 2 base out for left eye would be found in which quadrant? - correct
AnswersIV
Latest Review Guide
The correct transposed RX for -1.00-.50x37 is? - correct Answers-1.50 + 0.50 x 127
The correct transposition for +2.00 -2.00 x 060 is? - correct AnswersPlano +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 Answers60 mm
A +3.00 sphere lens has a front base curve of +6.25. What is the back surface curve? -
correct Answers-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 Answers-8.25 -1.00
Moving the optical center of a plus lens inward from the correct PD results in _____ -
correct AnswersBase in prism
Where will the optical center appear in a lensometer when neutralizing a left lens for
base in prism? - correct AnswersTo the left of the target center
Glazing is a term used to indicate _____ - correct AnswersA 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
Answersup
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 AnswersAngle 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 Answersnot 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 AnswersOD -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 Answers2.25 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 - correct Answers0.5 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 AnswersSkewed bridge
When a frame is said to have a parabolic curve (or positive face form), the following
condition is meant: - correct AnswersThe 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 AnswersIncrease minus power effect
Slab-off is ground on the lens that has the _____in the 090 meridian: - correct
AnswersWeaker plus
Which of the following areas is not a factor in determining vertical imbalance? - correct
AnswersAdd power
A lens dispersing white light into its component colors is an example of : - correct
AnswersChromatic 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 AnswersSpherical aberration
The aberration affecting image shape when wearing high minus lenses is called: -
correct Answersbarrel distortion
What type of prismatic effect is easiest to tolerate at the near point? - correct
AnswersBase in
You can eliminate the effects of pantoscopic angle by: - correct AnswersRaising 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
AnswersII
2 base down and 2 base out for left eye would be found in which quadrant? - correct
AnswersIV
