NAO VOLUME 3
The correct transposed RX for -1.00-.50x37 is? - Answer--1.50 + 0.50 x 127
The correct transposition for +2.00 -2.00 x 060 is? - 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: - Answer-60 mm
A +3.00 sphere lens has a front base curve of +6.25. What is the back surface curve? - 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? - Answer--
8.25 -1.00
Moving the optical center of a plus lens inward from the correct PD results in _____ - Answer-Base in
prism
Where will the optical center appear in a lensometer when neutralizing a left lens for base in prism? -
Answer-To the left of the target center
, Glazing is a term used to indicate _____ - 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: - 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: -
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 : - 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 - 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 - 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 - Answer-0.5 prism BI
The correct transposed RX for -1.00-.50x37 is? - Answer--1.50 + 0.50 x 127
The correct transposition for +2.00 -2.00 x 060 is? - 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: - Answer-60 mm
A +3.00 sphere lens has a front base curve of +6.25. What is the back surface curve? - 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? - Answer--
8.25 -1.00
Moving the optical center of a plus lens inward from the correct PD results in _____ - Answer-Base in
prism
Where will the optical center appear in a lensometer when neutralizing a left lens for base in prism? -
Answer-To the left of the target center
, Glazing is a term used to indicate _____ - 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: - 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: -
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 : - 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 - 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 - 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 - Answer-0.5 prism BI
