All Frisby Stereo Test Present “real depth” objects viewed with natural vision: not testing glasses are required.
Each plate has four random-patten squares, with a circle of pattern elements, lying in depth relative to its surround. The depth effect is due to the circle and its surround being printed on opposite sides of the plate.
The purpose of the Frisby Screening Stereo Test – Single Plate, is to demonstrate the presence of stereopsis.
