Lang stereotest

stereotest, Lang 

A random-dot stereogram upon which is imprinted a series of parallel strips of cylindrical lenses, which act to separate the views seen by each eye. There are three stereoscopic shapes that the patient has to identify: a cat (inducing 1200 seconds of arc of retinal disparity), a star (600 seconds of arc) and a car (550 seconds of arc). The test is administered at 40 cm and exactly in the frontoparallel plane. As there is no need to use special spectacles it is a very useful test for young children. Syn. Lang test. See random-dot stereogram.
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For children aged 36 to 72 months, the screening procedure entailed the administration of an external observation, LEA Symbols (Near and Far Acuity) (Hyvarinen, Nasanen, & Laurinen, 1980), the Lang Stereotest (Lang, 1988), and the MTI photoscreener.