Quiz 1

Question 1

For the following Rx, calculate for Reverse Slab Off Prism:

OD -3.00 -2.00 x180
OS -2.75 -2.50 x090
Add +1.25 Reading Level 8mm

a. 1.8 BD OD
b. 1.8 BD OS
c. 0.9 BD OD
d. 0.9 BD OS

Answer 1

b. 1.8 BD OS

Question 2

For the following Rx, calculate the Vertical imbalance at Near:

OD -3.00 -2.00 x180
OS -2.75 -2.50 x090
Add +1.25 Reading level 8mm

Vertical imbalance at near is:

a. 1.0 prism diopters V.I
b. 1.8 prism diopters V.I.
c. 2.75 prism diopters V.I.
d. 3.00 prism diopters V.I.

Answer 2

b. 1.8 prism diopters V.I.

Question 3

Determine the power in the vertical meridian for the following Rx?

Plano -3.75 x090

a. plano
b. -3.75
c. 090
d. -1.37

Answer 3

a. plano

Question 4

The wearer can opt for two pair of glasses (one single vision distance, one single vision reading) to correct for vertical imbalance at near.

a. True
b. False

Answer 4

a. True

Question 5

What is the image jump for the following?

FT35 glass bifocal, add +3.00

a. 3.5 prism diopters image jump
b. 3.0 prism diopters image jump
c. 1.5 prism diopters image jump
d. 1.0 prism diopters image jump

Answer 5

c. 1.5 prism diopters image jump

Question 6

For the following Rx, calculate for Slab Off Prism:

OD -4.00 +2.00 x060
OS -3.00 +3.00 x045
Add +2.50 Reading Level 9mm

a. 1.8 BU OD
b. 1.8 BD OS
c. 2.5 BU OD
d. 2.5 BU OS

Answer 6

a. 1.8 BU OD

Question 7

Determine the power in the vertical meridian for the following Rx?

+1.00 -4.00 x060

a. -1.00
b. -3.00
c. plano

Answer 7

c. plano

Question 8

Vertical imbalance of less than 2 diopters is never noticeable to the wearer.

a. True
b. False

Answer 8

b. False

Question 9

Determine the power in the vertical meridian for the following Rx?

-1.75 +5.00 x045

a. -1.75
b. +4.25
c. +0.75
d. +1.75

Answer 9

c. +0.75

Question 10

Which of the following multifocal construction methods is used only with glass?

a. Fused
b. One piece segment
c. Cement segment
d. Television segment

Answer 10

a. Fused

Question 11

Determine the power in the vertical meridian for the following Rx?

+2.00 +3.50 x135

a. +2.00
b. +3.30
c. +3.75
d. +5.50

Answer 11

c. +3.75

Question 12

What is the image jump for the following?

FT 28 bifocal, add +3.25

a. 0.5 prism diopters image jump
b. 5.0 prism diopters image jump
c. 1.63 prism diopters image jump
d. 16.3 prism diopters image jump

Answer 12

c. 1.63 prism diopters image jump

Question 13

What is the image jump for the following?

Ultex bifocal, add +1.75

a. 1.9 prism diopters image jump
b. 1.75 prism diopters image jump
c. 2.25 prism diopters image jump
d. 3.33 prism diopters image jump

Answer 13

d. 3.33 prism diopters image jump

Question 14

An optical difference at 90 degrees of 1.50 diopters or more should be considered for correction of vertical imbalance at near.

a. True
b. False

Answer 14

a. True

Question 15

Cosmetic appearance is a factor when using dissimilar segments to correct for vertical imbalance at near.

a. True
b. False

Answer 15

a. True

Question 16

For the following Rx calculate for Slab Off Prism:

OD -3.00 -2.00 x180
OS -2.75 -2.50 x090

Add +1.25 Reading level 8mm

a. 1.8 BU OD
b. 1.8 BU OS
c. 3.0 BU OD
d. 3.0 BU OS

Answer 16

a. 1.8 BU OD

Question 17

For the following Rx, calculate for Reverse Slab Off Prism:

OD -4.00 +2.00 x060
OS -3.00 +3.00 x045

Add +2.50 Reading level 9mm

a. 2.5 BU OD
b. 2.5 BD OS
c. 1.8 BU OD
d. 1.8 BD OS

Answer 17

d. 1.8 BD OS

Question 18

Which of the following is correct?

a. Distance power + near power = near addition
b. Distance power + near addition = near power
c. Near addition = distance power + near power
d. Near power = distance power - near addition

Answer 18

b. Distance power + near addition = near power

Question 19

Is the following statement true or false?

A flat top bifocal has its near optical center 5mm below the segment line regardless of the width and regardless whether it is a bifocal or trifocal.

a. True
b. False

Answer 19

a. True

Question 20

What is the image jump in a 22-mm round bifocal with an add power of +2.00?

a. 0.60 prism diopters
b. 2.2 prism diopters
c. 1.0 prism diopters
d. there is no image jump with this lens

Answer 20

b. 2.2 prism diopters

Question 21

Determine the power in the vertical meridian for the following Rx?

-1.25 -2.00 x180

a. -1.25
b. -2.00
c. -3.00
d. -3.25

Answer 21

d. -3.25

Question 22

Prism segments are widely used to correct vertical imbalance.

a. True
b. False

Answer 22

b. False

Question 23

A prescription reads as follows:

OD -0.50 -0.25 x180
OS -0.50 -0.25 x180

Add +2.00 OU

The wearer wants a pair of glasses for distance and a pair for reading. What powers would be ordered for the reading glasses?

a. OD +2.00D sph OS +2.00 sph
b. OD +2.50 -0.25 x180 OS +2.50 -0.25 x180
c. OD +2.00 -0.25 x180 OS +2.00 -0.25 x180
d. OD +1.50D sph OS +1.50D sph
e. OD +1.50 -0.25 x 180 OS +1.50 -0.25 x180

Answer 23

e. OD +1.50 -0.25 x180 OS +1.50 -0.25 x180

Question 24

Determine the power in the vertical meridian for the following Rx?

+5.37 -4.00 x150

a. +5.37
b. +1.37
c. -1.37
d. 2.37

Answer 24

d. 2.37

Question 25

For the following Rx, calculate the Vertical imbalance at Near: OD -4.00 +2.00 x060 OS -3.00 +3.00 x045 Add +2.50 Reading Level 9mm a. 1.0 prism diopters V.I. b. 1.5 prism diopters V.I. c. 1.8 prism diopters V.I. d. 2.0 prism diopters V.I.

Answer 25

c. 1.8 prism diopters V.I.