The visual cliff is used primarily to test an infant's depth perception.

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The visual cliff is a laboratory device primarily used to test the depth perception of infants and young animals. It consists of a transparent plexiglass surface that appears to be a drop-off, with a patterned cloth or board underneath to provide the illusion of depth. Infants are placed on the visual cliff to see if they can perceive the drop-off and will hesitate or crawl across.

The Visual Cliff Is Used Primarily to Test an Infant's