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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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.

Pseudoamblyopia in Congenital Cyclotropia

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.

Eye screening with the Lang stereotest. The American Journal of Orthopedics, 38, 48-50.

Screening for amblyogenic factors in a rural state: implementing a statewide childhood vision project

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