Sensory Fusion

Question 1

type of fusion where adequate vergence (system that makes the eyes work as a team) skills maintain sensory fusion

Answer 1

motor fusion

Question 2

type of fusion where neurological “blending: of two monocular images into a single binocular image that has greater information

Answer 2

sensory fusion

Question 3

no sensory fusion can be caused by:

Answer 3

• deep suppression
• ocular pathology
• amblyopia

Question 4

first degree sensory fusion is called

Answer 4

superimposition

Question 5

second degree sensory fusion is called

Answer 5

flat fusion

Question 6

third degree sensory fusion is called

Answer 6

stereopsis

Question 7

first degree fusion means

Answer 7

seeing with both eyes at the same time and place

not true sensory fusion

Question 8

second degree fusion means

Answer 8

seeing with two eyes at the same time and same place

Question 9

third degree fusion means

Answer 9

perception of three-dimensional visual space due to fusion of disparate retinal images

Question 10

measurements of stereopsis are in

Answer 10

angular seperation of points in second of arc

Question 11

normal stereopsis threshold range

Answer 11

1.6- 24 seconds of arc

Question 12

clinical testing methods test to ____ seconds of arc

Answer 12

12.5

Question 13

figures that have obvious monocular cues and may give false positive stereo responses are in _____ stereopsis

Answer 13

local / lateral

Question 14

no monocular cues, and patient must be able to “bi-fixate” target is in _____ stereopsis

Answer 14

global

Question 15

simple retinal disparity tested in ____ stereopsis

Answer 15

local

Question 16

random dot test is in ____ stereopsis

Answer 16

global

Question 17

useage and pros of local stereopsis

Answer 17

• used in screenings, primary care

- can provide stereo “acuity”, usually 20” arc limit

Question 18

useage and pros/cons of global stereopsis

Answer 18

• used with kids, people with strabismus, or people who fail local test
• does not give you threshold acuity

Question 19

common clinically used tests for second degree (flat fusion)

Answer 19

• worth dot test
• pediatric flashlight
• red lens test

Question 20

common contours and not identical objects are characteristic of ____ degree fusion

Answer 20

2nd degree (flat fusion)

Question 21

in worth dot test, patient reports seeing ___ dots in normal fusion

Answer 21

4 dots

Question 22

in worth dot test, patient reports seeing ____ dots in what locations for EXO (crossed diplopia)

Answer 22

5 dots

• red lights on left
• green lights on right

Question 23

in worth dot test, patient reports seeing _____ dots in what locations for ESO (uncrossed diplopia)

Answer 23

5 dots

• red lights on right
• green lights on left

Question 24

in worth dot test, patient reports seeing ____ dots for suppression

Answer 24

either 2 red (OS suppression) or 3 green (OD suppression)

Question 25

red dot test: when patient sees 1 light and its pink, it is:

Answer 25

fusion

Question 26

red dot test: when patient sees 2 lights and the red light is on the right, it is:

Answer 26

eso- uncrossed diplopia

Question 27

red dot test: when patient sees 2 lights and the red lens is on the left, it is:

Answer 27

exo- crossed diplopia

Question 28

red dot test: when patient sees 1 light and it is only white

Answer 28

OD suppression