Minus Lens Amplitude*

Question 1

What is the illumination for minus lens amplitude?

Answer 1

Bright

Question 2

What is the purpose of minus lens amplitude?

Answer 2

Assess patient’s ability to fully accommodate

Question 3

What is the correction for ML amplitude?

Answer 3

Proper distance refraction

Question 4

What is the target for minus lens?

Answer 4

Letters 1-2 lines above near acuity set at 40cm (2.5D working distance

Question 5

What do we have to do before starting minus lens?

Answer 5

Converge the phoropter

Question 6

Is minus lens performed monocularly or bi?

Answer 6

Mono (occlude eye that is not being tested)
Doctor will tell you which to perform on

Question 7

How is the test performed?

Answer 7

Slowly introduce minus lenses in front of patient until sustained blur is obtained
Encourage patient to clear up target and continue adding lenses

Question 8

What is the recording for ML amplitude testing?

Answer 8

Add 2.50 to amount of minus lens introduced
Use unit (D)
Do not use signage (+ or -)

Minus lens OD 9.00D, OS 9.25D

Question 9

What are the normal ranges based on age?

Answer 9

20- 9.50D
25- 8.50
30- 7.50