Concepts Test

Question 1

What amount of tolerance does ANSI allow for the axis of the following prescription? -0.50 -0.75 x 009

Answer 1

5 degrees

Question 2

Accumulation of lens material between the abrasive particles on the wheels surface.

Answer 2

Glazing

Question 3

What amount of tolerance does ANSI allow for the cylinder power of a FT 7x27 lens?
Prescription power: -6.50 -4.50 x 180

Answer 3

0.15D

Question 4

the proper DBL measurements

Answer 4

shortest distance between the lenses

Question 5

If no decentration is performed during the edging process, where will the optical center be located once the lens is mounted in the frame?

Answer 5

at the boxing center of the frame

Question 6

Use the … binocular PD to calculate decentration forthis reading pair.

Answer 6

near

Question 7

“OK to split”
OD -3.50 -1.00 x 010 3^ BD
OS -4.00 -1.75 x 160

Answer 7

OD 1.5^ BD & OS 1.5^ BU

Question 8

uncut lens; because the lens has not been cut down to the shape of the frame.

Answer 8

Finished lens blank

Question 9

When measuring vertical imbalance in a pair of glasses, the unwanted vertical prism amount will be measured…

Answer 9

the lens with the weakest power in the 90 meridian

Question 10

If a pattern is marked, “set -5”, which of the following is the pattern’s A dimension

Answer 10

41.5

Question 11

If there is …, then the wearer cannot look through the OC because it does not have any prism at that point by definition.

Answer 11

prescribed prism