Unit 3 - Optical Prism Analysis

Question 1

Calculate the amount of decentration and direction needed to create the prism given:

+2.00 sphere, 2.0 BO

10 mm out
4 mm out
4 mm up
10 mm in

Answer 1

10 mm out

Question 2

Calculate the amount of decentration and direction needed to create the prism given:

+2.50-0.50 x180, 1.0 BU

5 mm down
5 mm up
10 mm down
10 mm up

Answer 2

5 mm up

Question 3

Calculate the amount of decentration and direction needed to create the prism given:

-2.50-1.00 x045, 1.5 BI prism

5 mm up
5 mm out
5 mm in
5 mm down

Answer 3

5 mm out

Question 4

Calculate the amount of decentration and direction needed to create the prism given:

-5.25-1.00 x030, 1.5 BU prism

5 mm down
2.5 mm up
2.5 mm down
4 mm out

Answer 4

2.5 mm down

Question 5

How much prism is induced and in which base direction?
Lens, Rt. SV +5.00 sphere
Moved 4 mm to the patient’s right

0. 20 BO
1. 0 BO
2. 0 BI
3. 0 BI

Answer 5

2.0 BO

Question 6

How much prism is induced and in which base direction?
Lens, Rt. FT28
-2.50-0.50 x180
Moved 5 mm up

1. 5 BU
2. 5 BD
3. 0 BU
4. 0 BU

Answer 6

1.5 BD

Question 7

How much prism is induced and in which base direction?
Lens, Left SV -1.00-1.00 x 060
Moved 2 mm to the patient’s right

2. 0 BI
3. 35 BO
4. 5 BO
5. 0 BO

Answer 7

0.35 BO

Question 8

A +2.00 sphere lens moved to the left in the patient’s right eye creates what type of prism?

BO
BI
BU
BD

Answer 8

BI

Question 9

A lens over the patient’s left eye has the power of +1.00-1.00 x180 is moved to the left. What type of prism is created?

BO
BD
BI
BU

Answer 9

BO

Question 10

There is always prism exhibited at the PRP.
True
False

Answer 10

False