NAO Volume 3 Exam with all Correct & 100% Verified
Answers |Actual Complete Update |Already Graded A+
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
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
Answers |Actual Complete Update |Already Graded A+
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
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
