AC/A Ratio

Question 1

distance phoria dependent on:

Answer 1

tonic vergence

Question 2

near phoria dependent on:

Answer 2

AC/A ratio

Question 3

range of expected AC/A ratios

Answer 3

4/1 with +/- 2

so from 2-6 is normal

Question 4

more eso at near = ____ AC/A ratio

Answer 4

high

Question 5

more exo at near = ____ AC/A ratio

Answer 5

low

Question 6

what type of AC/A ratio tends to underestimate

Answer 6

gradient AC/A

Question 7

why does gradient AC/A ratio underestimate?

Answer 7

lag of accommodation (which is generally +0.25 to +0.50)

Question 8

low AC/A ratio can lead to what binocular vision dysfunctions?

Answer 8

• convergence insufficiency (CI)

- divergence insufficiency (DI)

Question 9

high AC/A ratio can lead to what binocular vision dysfunctions?

Answer 9

• convergence excess (CE)

- divergence excess (DE)