Quiz 5

Question 1

Which is the most favorable alternative to a 50-20 frame for measuring bifocal height when that particular size is not available?

Answer 1

A. 52-18
B. 50-18
C. 48-20 *
D. 50-22

Question 2

When measuring for multifocal heights, that portion of the eyewire directly below the pupil is used as a zero point, since this is the area of the frame where the multifocal will be placed.

Answer 2

True

False *

Question 3

A distometer is used to:

Answer 3

A. measure distance between lenses and frame eyesize
B. measure the power of a spectacle lens
C. measure the PD
D. measure the vertex distance *

Question 4

The OC and the MRP are at exactly the same point on the lens except:

Answer 4

A. when there is prescribed cylinder present in the prescription
B. when there is prescribed prism present in the prescription *
C. when a bifocal segment has a raise instead of a drop
D. the OC and the MRP are never at exactly the same point on a lens

Question 5

The bifocal height for a child should be positioned:

Answer 5

A. at the lower limbus
B. between the lower limbus and the lower edge of the pupil
C. 1 mm below the lower edge of the pupil
D. at the center of the pupil *