Steropsis/W4D Flashcards
What is sensory fusion?
Uniting two images into 1
What are the 4 types of stereopsis?
Gross
Fine
Local
Global
Gross stereopsis
Large retinal disparities involvement of fovea and peripheral retina
Fine stereopsis
Small retinal disparities mainly foveal
Local stereopsis
Analysis of patterns over a small area of stimulus
Monocular cues possible
Global stereopsis
Analysis of pattern components over entire stimulus area
Patient must bifoveate
What is the highest level of stereopsis
Global
What is stereoacuity
Measured amount of stereopsis
Simultaneous perception
Able to see one image with each eye
No supression
Superimposition
Able to overlap images with different contours
Flat fusion
Able to overlap images with similar contours
Stereopsis
True binocular perception of 3D space
What is a distance local stereopsis test?
Vectographic projection
Randot E
Forced choice of which E is raised
Global
Lang test
2 levels of disparity, global
Butterfly
Global target with decreasing disparity
Forms
Global target with smaller disparities
Fly
Large disparity local stereo
Wirt rings
Local targets with decreasing stereo
Monocular cues help
Animals
Local targets, kid friendly
Local norm
40-20’’
Global norm
Down to 40’’, but any positive answer is good enough
What are the three responses for W4D?
Fusion
Diplopia
Suppression
suppression in dark
Deep suppression
Suppression in bright
Shallow suppression
Fusion at nose
Peripheral region of retina
Fusion at distance
Central retina stimulated
