Stereopsis and measurement by clinical tests

Clinical Tests used to measure Stereopsis >>>



There are two groups of clinical tests used to measure stereopsis.

These are the contour stereotests and the random-dot stereotest.

Random-dot stereograms were first used by Julesz (1960) to eliminate

monocular cues. As there are no contours, depth perception (stereopsis)

can only be appreciated when binocular fusion occurs. Two process of

stereopsis are used and these are local and global stereopsis. Local

stereopsis exists to evaluate the two horizontally disparate stimuli. This

process is sufficient for contour stereotests. Global stereopsis is required

in random-dot stereogram when the evaluation and correlation of

corresponding points and disparate points are needed over a large retinal
area.


يتبع بعون الله تعالى ،،،

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An example of a contour stereotest used in the clinic is the Titmus Fly Stereotest.

In the Titmus Fly Stereotest, horizontal disparity is presented via the vectographic

technique (Fricke and Siderov, 1997). When tested a 40 cm the fly has a disparity of

3,600 sec of arc; the disparity of the animals range from 400 - 100 sec of arc and

the disparity of the Wirt rings range from 800 - 40 sec of arc 8).





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