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What is stereoperimetry?
testing stereoacuity at different location within the visual field
What is a stereoscopic scotoma?
areas within which they are unable to perceive either crossed or uncrossed disparities
What is stereomotion scotomas?
areas within which they are unable to perceive motion in depth although they can appreciate static stereoscopic depth within these same areas
T or F: patients with reduced or absent stereopsis due to infantile or late onset esotropia have been shown to be able to perceive motion in depth
True
What are the 3 disparity channels of disparity processing?
-zero
-crossed
-uncrossed
approximately 30% of the population may be stereoblind in some form
What do clinical stereoacuity tests employ?
crossed disparities; invert test 180° to screen for uncrossed stereopsis
What happens to the upper stereoscopic limit in patients with elevated stereo thresholds from strabismus?
they remain intact; the patients may experience decreased spatial resolution for stereopsis
T or F: Stereomotion has been shown to be preserved in strabismic subjects who are stereo blind to small relative binocular disparities.
True
What is worse for individuals with normal binocular vision (dynamic or static stereoacuity)?
dynamic is worse
What is better for patients with abnormal binocular vision?
both static and dynamic stereoacuity is elevated but dynamic is generally better
