Dr. Jensen - AC/A Ratio

Question 1

When measuring the AC/A, when do you use this method?

Answer 1

At near only.

Question 2

By how much increments should you be using when trying to calculate AC/A ratio?

Answer 2

1D.

Question 3

When measuring the type of phoria, what would be the finding if you had a negative finding?

Answer 3

Exophoria. Eso = positive

Question 4

True or False. Tonic, Proximal and Fusional always impact the AC/A testing.

Answer 4

False. Fusional does not effect it.

Question 5

What is the formula for convergence demand?

Answer 5

CD = PD x MA

Question 6

What is the formula for AC/A?

Answer 6

AC/A = {CD - (DLP-NLP)} / change in accommodation

Question 7

What is accommodative insufficiency?

Answer 7

Blurry vision at near, discomfort of strain near tasks. Often associated with esophoria and low accommodative amp. Typically will accept plus at any age

Question 8

What is the power of the cornea?

Answer 8

43 D

Question 9

What is the power of the lens?

Answer 9

17 D

Question 10

What is the axial length of the eye?

Answer 10

24 mm

Question 11

Which area of the eye causes the greatest change in dioptric effect?

Answer 11

Anterior of the cornea

Question 12

What is the hallmark of accommodative insufficiency?

Answer 12

Low accommodative ampitude and esophoria at near

Question 13

What is the hallmark of convergence insufficiency?

Answer 13

Higher exophoria at near