Cover Test

Question 1

a condition in which binocular fixation is not present under normal seeing conditions

Answer 1

strabismus

Question 2

a misalignment of the lines of sight as an object of regard that is present only when fusion is disrupted (i.e. one eye is covered)

Answer 2

phoria

Question 3

test used to determine the presence or absence of a strabismus

Answer 3

UCT (unilateral cover test)

Question 4

UCT determines what

Answer 4

• presence of absence of strabismus
• direction
• laterality
• frequency
• estimate of magnitude

Question 5

test used to determine the magnitude of the deviation is called

Answer 5

ACT (alternating cover test)

Question 6

how do you control accommodation in the UCT

Answer 6

• wear best rx
• threshold target a few lines above VA
• instruct to keep clear

Question 7

when adding prism in ACT, which direction is the base in comparison to the eye movement seen?

Answer 7

base of prism in direction of eye movement

Question 8

• horizontal outward deviation

- eye movement inward to regain fixation

Answer 8

exo

Question 9

• horizontal deviation towards the midline

- eye movement outward

Answer 9

eso

Question 10

• vertical deviation upward

- eye movement downward

Answer 10

hyper

Question 11

• vertical deviation downward

- eye movement upward

Answer 11

hypo

Question 12

normative values for:

-horizontal phorias at far

Answer 12

1 exo +/- 2 pd

1 eso to 3 eso

Question 13

normative values for:

-horizontal phorias at near

Answer 13

3 exo +/- 3 pd

ortho to 6 exo

Question 14

normative values for:

-vertical phorias at far or at near

Answer 14

0 +/- 0.5 pd hyper

0.5 right hyper to 0.5 left hyper