FREE ABO-NOCE Applying Prentice's Rule Questions and Answers

Question 1

A patient with a prescription of -4.00 DS looks 5 mm above the optical center. How much prism is induced and in what direction?

Accepted Answer

2.0Δ Base Down

Answer

2.0Δ Base Up

Answer

0.8Δ Base Up

Answer

0.8Δ Base Down

Question 2

A lens with a power of +6.00 D is decentered 3 mm nasally. What is the resulting prism?

Accepted Answer

1.8Δ Base In

Answer

1.8Δ Base Out

Answer

2.0Δ Base In

Answer

2.0Δ Base Out

Question 3

A patient's PD is 64 mm, but their glasses were made with the optical centers at 60 mm. If the Rx is -5.00 DS in both eyes, what is the total induced prism?

Accepted Answer

2.0Δ Base Out

Answer

2.0Δ Base In

Answer

1.0Δ Base Out

Answer

1.0Δ Base In

Question 4

How much must a -10.00 D lens be decentered to produce 3.0Δ of prism?

Accepted Answer

3 mm

Answer

1.5 mm

Answer

3.3 mm

Answer

30 mm

Question 5

A patient with Rx OD: +2.00 DS, OS: +4.00 DS looks 10 mm down to read. What is the vertical imbalance?

Accepted Answer

2.0Δ

Answer

1.0Δ

Answer

4.0Δ

Answer

6.0Δ

Question 6

In the formula P = cF, the variable 'c' must be expressed in which unit?

Accepted Answer

Centimeters

Answer

Millimeters

Answer

Inches

Answer

Meters

Question 7

A patient wearing +3.50 D reading glasses holds their reading material 4 cm to the right of center. How much prism is induced horizontally?

Accepted Answer

0Δ

Answer

1.4Δ Base Out

Answer

14.0Δ Base Out

Answer

0.875Δ Base Out