NAO Volume 3 2025-2026 update Q&A verified
The correct transposed RX for -1.00-.50x37 is? - ✔✔ANS -1.50 + 0.50 x 127
The correct transposition for +2.00 -2.00 x 060 is? - ✔✔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 len
decentered 3 mm in: - ✔✔ANS 60 mm
A +3.00 sphere lens has a front base curve of +6.25. What is the back surface curve? - ✔✔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? - ✔✔ANS -8.2
-1.00
Moving the optical center of a plus lens inward from the correct PD results in _____ - ✔✔ANS Base i
prism
Where will the optical center appear in a lensometer when neutralizing a left lens for base in prism?
✔✔ANS To the left of the target center
Glazing is a term used to indicate _____ - ✔✔ANS A defect that occurs when an anti-reflective lens is tinte
Frequently, bicentric grinding (slab-off) is used as a means of obtaining prism in the reading field t
correct induced prism imbalance. The usual correction during the fabrication process is achieved b
grinding prism in the following direction: - ✔✔ANS up
A patient stops in to see you for adjustment of his glasses. After careful inspection you find the only thin
wrong that there is too much pantoscopic tilt. To make the necessary adjustment you will: - ✔✔ANS Angl
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 bas
in : - ✔✔ANS not possible
, Rewrite the RX below, which is prescribed for a patient afflicted with double vision, so as to make bette
balanced lenses:
OD -1.00 -0.50 x 090 5.00 BU
OS -1.25 - 0.50 x 090 1.00 BD - ✔✔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 - ✔✔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 distanc
PD is only 62 mm. If by some unfortunate error the lenses are not decentered at all, how much prism i
created in each eye?
RX: OU -2.25 -1.50 x 045 - ✔✔ANS 0.5 prism BI
A situation where the frame front is somewhat twisted, with the planes of the two lenses being out of lin
with one another, is called: - ✔✔ANS Skewed bridge
When a frame is said to have a parabolic curve (or positive face form), the following condition is meant:
✔✔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 wi
this have on the lenses? - ✔✔ANS Increase minus power effect
Slab-off is ground on the lens that has the _____in the 090 meridian: - ✔✔ANS Weaker plus
Which of the following areas is not a factor in determining vertical imbalance? - ✔✔ANS Add power
A lens dispersing white light into its component colors is an example of : - ✔✔ANS Chromatic aberratio
The lens aberration that produces a shorter focal length for rays near the edge of the lens than rays nea
the optical axis is called: - ✔✔ANS Spherical aberration
The aberration affecting image shape when wearing high minus lenses is called: - ✔✔ANS barrel distortio
What type of prismatic effect is easiest to tolerate at the near point? - ✔✔ANS Base in
The correct transposed RX for -1.00-.50x37 is? - ✔✔ANS -1.50 + 0.50 x 127
The correct transposition for +2.00 -2.00 x 060 is? - ✔✔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 len
decentered 3 mm in: - ✔✔ANS 60 mm
A +3.00 sphere lens has a front base curve of +6.25. What is the back surface curve? - ✔✔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? - ✔✔ANS -8.2
-1.00
Moving the optical center of a plus lens inward from the correct PD results in _____ - ✔✔ANS Base i
prism
Where will the optical center appear in a lensometer when neutralizing a left lens for base in prism?
✔✔ANS To the left of the target center
Glazing is a term used to indicate _____ - ✔✔ANS A defect that occurs when an anti-reflective lens is tinte
Frequently, bicentric grinding (slab-off) is used as a means of obtaining prism in the reading field t
correct induced prism imbalance. The usual correction during the fabrication process is achieved b
grinding prism in the following direction: - ✔✔ANS up
A patient stops in to see you for adjustment of his glasses. After careful inspection you find the only thin
wrong that there is too much pantoscopic tilt. To make the necessary adjustment you will: - ✔✔ANS Angl
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 bas
in : - ✔✔ANS not possible
, Rewrite the RX below, which is prescribed for a patient afflicted with double vision, so as to make bette
balanced lenses:
OD -1.00 -0.50 x 090 5.00 BU
OS -1.25 - 0.50 x 090 1.00 BD - ✔✔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 - ✔✔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 distanc
PD is only 62 mm. If by some unfortunate error the lenses are not decentered at all, how much prism i
created in each eye?
RX: OU -2.25 -1.50 x 045 - ✔✔ANS 0.5 prism BI
A situation where the frame front is somewhat twisted, with the planes of the two lenses being out of lin
with one another, is called: - ✔✔ANS Skewed bridge
When a frame is said to have a parabolic curve (or positive face form), the following condition is meant:
✔✔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 wi
this have on the lenses? - ✔✔ANS Increase minus power effect
Slab-off is ground on the lens that has the _____in the 090 meridian: - ✔✔ANS Weaker plus
Which of the following areas is not a factor in determining vertical imbalance? - ✔✔ANS Add power
A lens dispersing white light into its component colors is an example of : - ✔✔ANS Chromatic aberratio
The lens aberration that produces a shorter focal length for rays near the edge of the lens than rays nea
the optical axis is called: - ✔✔ANS Spherical aberration
The aberration affecting image shape when wearing high minus lenses is called: - ✔✔ANS barrel distortio
What type of prismatic effect is easiest to tolerate at the near point? - ✔✔ANS Base in
