random-dot stereogram

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stereogram, random-dot (RDS) 

A stereogram in which the eye sees an array of little characters or dots of a roughly uniform texture and containing no recognizable shape or contours. The only difference is that a certain region in one target has been laterally displaced with respect to the other, to produce some retinal disparity. When they are viewed in a stereoscope, that region is seen in stereoscopic relief. The shape in that region can be any pattern. The effect is remarkable as the shape usually appears to float out from the surround. Syn. Julesz random-dot stereogram.The random-dot E test uses a polarized random test pattern and requires the use of Polaroid spectacles to detect whether a subject has stereopsis. The subject will see a raised letter E in the random-dot pattern of one of the test plates. At 50cm, the retinal disparity induced by the E is 500 seconds of arc. The TNO test for stereoscopic vision also uses random-dot stereograms in which the half-images have been superimposed and printed in complementary colours, like anaglyphs. The test plates, when viewed with red and green spectacles, elicit stereopsis. There is a series of plates inducing retinal disparities ranging from 15 to 480 seconds of arc. See stereoscopic visual acuity; anaglyph; retinal disparity; Frisby stereotest; Lang stereotest; two-dimensional test; vectogram.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
Stereoacuity was measured with either Lang stereotest (Lang-Stereotest AG, Kusnacht, Switzerland) in all patients or TNO test (Lameris Instrumenten B.V., Utrecht, The Netherlands) in 6 out of 10 patients.
The summary of pre- and postoperative measurements of BCVA, refraction, stereopsis (Lang test and TNO test), and Worth 4-light test is shown in Table 1.
Random dot stereopsis measured with the TNO test in 6 out of 10 patients resulted absence in all the measured patients before surgery.
Stereoacuity was measured in the sitting position at 40 cm in both contour (Titmus Fly test) and random dot (TNO test) stereograms under photopic conditions (85cd/m2) with the presbyopia correction, if needed.
Average stereopsis scores of the group were better in Titmus test (56.0 [+ or -] 36.6) than in TNO test (98.1 [+ or -] 102.4).
TNO tested a number of mocap systems before selecting Animazoo's IGS-190, the company said.