Chapter 19

Question 1

Multifocal lenses focus light at

Answer 1

Multiple distances

Question 2

The amount of plus power needed for near vision is

Answer 2

+2.00 D

Question 3

What is a near addition/near segment

Answer 3

A small lens “added on”; the algebraic sum of the distance power and near add

Question 4

The intermediate area found in trifocals is used for

Answer 4

Viewing objects that aren’t at normal reading distance and is normally 50% of near add

Question 5

What are three ways bifocals and trifocals are constructed

Answer 5

1. Fused
2. One piece
3. Cement lenses

Question 6

Fused focals are only

Answer 6

Available in glass

Question 7

Which focals have no ledge/curvature on the front

Answer 7

Fused

Question 8

Which focals are made from one lens material and any material

Answer 8

One piece

Question 9

One pieces can be identified by

Answer 9

The segment border

Question 10

Cement lenses are

Answer 10

Custom-made with a small segment glued into the distance lens

Question 11

Where is the optical center in round segment bifocals

Answer 11

In the center of the segment

Question 12

What are blended bifocals

Answer 12

Round-segment bifocals with border smoothed out to keep the segment from being seen

Question 13

Where is the optical center in flat-top segments

Answer 13

5mm below the segment line

Question 14

Panoptik segments are

Answer 14

Segments similar to curved top with extremely round corners

Question 15

What are ribbon segments

Answer 15

Round segments with the top and bottom cut off. These are only available in glass.

Question 16

What are the two types of ribbon segments

Answer 16

B and R

Question 17

B segments are only 9mm deep and are good for people who

Answer 17

Must be able to have distance vision below bifocal area

Question 18

Which segments are seldom used as regular bifocal lens

Answer 18

R segments