1 Exampromax - Stuvia US 2025/2026
NAO VOLUME 3 Questions and Answers
(100% Correct Answers) Already Graded A+
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 lens decentered 3 mm in:
© 2025 Assignment Expert
Ans: 60 mm
Exampromax - Stuvia US
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: -8.25 -1.00
Moving the optical center of a plus lens inward from the correct PD results
in _____
Ans: Base in 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 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
, 2 Exampromax - Stuvia US 2025/2026
correction during the fabrication process is achieved by 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 thing wrong that there is too much pantoscopic
tilt. To make the necessary adjustment you will:
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 :
Ans: not possible
© 2025 Assignment Expert
Rewrite the RX below, which is prescribed for a patient afflicted with
Exampromax - Stuvia US
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
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 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
Ans: 0.5 prism BI
NAO VOLUME 3 Questions and Answers
(100% Correct Answers) Already Graded A+
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 lens decentered 3 mm in:
© 2025 Assignment Expert
Ans: 60 mm
Exampromax - Stuvia US
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: -8.25 -1.00
Moving the optical center of a plus lens inward from the correct PD results
in _____
Ans: Base in 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 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
, 2 Exampromax - Stuvia US 2025/2026
correction during the fabrication process is achieved by 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 thing wrong that there is too much pantoscopic
tilt. To make the necessary adjustment you will:
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 :
Ans: not possible
© 2025 Assignment Expert
Rewrite the RX below, which is prescribed for a patient afflicted with
Exampromax - Stuvia US
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
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 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
Ans: 0.5 prism BI
