OPT-1156 Ophthalmic Lens II Unit 1

Question 1

A prescription reads as follows:
-0.50 –0.25 x 180
-0.50 –0.25 x 180
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?

Answer 1

+1.50 –0.25 x 180 +1.50 –0.25 x 18o

Question 2

True or False Distance power + near addition = near power

Answer 2

True

Question 3

For the following Rx, calculate the Vertical Imbalance at Near:
OD: -3.00 –2.00 x 180
OS: -2.75 –2.50 x 090
Add +1.25 Reading Level 8mm
Vertical Imbalance at near is:

Answer 3

1.8 prism diopters V.I.

Question 4

Determine the power in the vertical meridian for the following Rx?
+2.00 +3.50 x 135

Answer 4

+3.75

Question 5

What is the image jump for the following?

FT 35 glass bifocal, add +3.00

Answer 5

1.5 prism diopters image jump

Question 6

Determine the power in the vertical meridian for the following Rx?
-1.75 +5.00 x 045

Answer 6

+0.75

Question 7

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

Answer 7

True

Question 8

What is the image jump for the following?

. FT 28 bifocal, add +3.25

Answer 8

1.63 prism diopters image jump

Question 9

For the following Rx, calculate for Reverse Slab Off Prism:
OD: -4.00 +2.00 x 060
OS: -3.00 +3.00 x 045
Add +2.50 Reading Level 9mm

Answer 9

1.8 BD OS

Question 10

For the following Rx, calculate for Slab Off Prism:
OD: -3.00 –2.00 x 180
OS: -2.75 –2.50 x 090
Add +1.25 Reading Level 8mm

Answer 10

1.8 BU OD

Question 11

Determine the power in the vertical meridian for the following Rx?
Plano-3.75 x 090

Answer 11

plano

Question 12

Prism segments are widely used to correct vertical imbalance.

Answer 12

False

Question 13

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

Answer 13

False

Question 14

Determine the power in the vertical meridian for the following Rx?
-1.25 –2.00 x 180

Answer 14

–3.25

Question 15

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

Answer 15

True

Question 16

Determine the power in the vertical meridian for the following Rx?
+5.37 –4.00 x 150

Answer 16

+2.37

Question 17

For the following Rx, calculate for Slab Off Prism:
OD: -4.00 +2.00 x 060
OS: -3.00 +3.00 x 045
Add +2.50 Reading Level 9mm

Answer 17

1.8 BU OD

Question 18

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

Answer 18

True

Question 19

Determine the power in the vertical meridian for the following Rx?
+1.00 –4.00 x 060

Answer 19

plano

Question 20

Vertical imbalance of more than 2 diopters should always be considered.

Answer 20

False

Question 21

For the following Rx, calculate the Vertical Imbalance at Near:
OD: -4.00 +2.00 x 060
OS: -3.00 +3.00 x 045
Add +2.50 Reading Level 9mm

Answer 21

1.8 prism diopters V.I.

Question 22

What is the image jump for the following?

Ultex bifocal, add +1.75

Answer 22

3.33 prism diopters image jump

Question 23

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

Answer 23

fused

Question 24

For the following Rx, calculate for Reverse Slab Off Prism:
OD: -3.00 –2.00 x 180
OS: -2.75 –2.50 x 090
Add +1.25 Reading Level 8mm

Answer 24

1.8 BD OS

Question 25

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

Answer 25

2.2 prism diopters