Suppression Tests: worth 4 dot and 4BO test Flashcards Preview

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Flashcards in Suppression Tests: worth 4 dot and 4BO test Deck (28):
1

what is Worth's 0 degree of fusion

no sensory fusion- suppression/monocular vision (may also have diplopia)

2

What two tests can be used when central suppression scotoma is suspected

Worth a-Dot and 4-Prism Base Out tests

3

what is Worth's 1st degree of fusion

simultaneous fusion- diplopia/confusion

4

what is Worth's 2nd degree of fusion

flat fusion/superimposition- no diplopia, no stereo, has motor fusion

5

what is Worth's 3rd degree of fusion

stereopsis (highest degree)- ultimate sensory fusion

6

how do you test for the highest level of stereopsis (degree 3)

use Randot (VAC) stereo test

7

what is suspected if the patient has less than 40 sec of arc on the Randot stereo test

suspect suppression or a central scotoma

8

what test is used for flat fusion (degree 2)

the Worth 4 Dot test

9

what must the patient have in order to do the Worth 4 Dot test

flat fusion at 40cm

10

what does the Worth 4 Dot test for

binocular central suppression scotoma

11

when do you stop moving away from the patient with the Worth 4 Dot test

when there is a change in the number of dots seen or 3m

12

what happens if the patient covers one eye and the dots reappear

the patient has a scotoma under binocular conditions

13

what happens if the patient covers one eye and the dots do not reappear

the scotoma is under monocular conditions of the eye uncovered (check both eyes separately)

14

how many dots should the patient be able to see with only the OD

2 red

15

how many dots should the patient be able to see with only the OS

3 green

16

what does the patient have if they see 2 red dots binocularly

they are suppressing OS

17

what does the patient have if they see 3 green dots binocularly

suppressing OD

18

what does the patient have if they see 5 dots binocularly

not fusing images - diplopia

19

what does the patient have if they see 5 dots and the red dots are to their right

uncrossed diplopia (ESO deviation)

20

what does the patient have if they see 5 dots and the red dots are to their left

crossed diplopia (EXO deviation)

21

what does the patient have if they see 5 dots and the red dots are below the green dots

Right hyper-deviation

22

what does the patient have if they see 5 dots and the red dots are above the green dots

left hyper-deviation

23

what 3 things do you record for the Worth 4 Dot test

test distance, fusion or suppression, and Exo, Eso, R hyper or L hyper

24

what are 4 situations you would want to use the Worth 4 Dot test

determine suppressing eye (less than 40 sec arc), differential diagnosis of unilateral decreased VA (NIPH), detect small unilateral central scotomas, and preschool children

25

when would you use a 4BO prism test

to check for central scotomas (slightly reduced VA, mildly reduced stereo (30-80 sec arc), small angle strabismus, and macular diseases)

26

what type of target does the patient look at during the 4BO prism test

a single letter one line above better seeing eye

27

what is a normal response to the 4BO prism test

version and vergence on both eyes (separately)

28

what is an abnormal response to the 4BO prism test

neither eye moves in response to the prism (the eye that doesn't move = suppressing eye because no diplopia occurred)