The Frisby Near Stereotest is a three-plate, real-depth stereoacuity test for assessing stereopsis, or binocular depth perception, in children and adults. It uses natural viewing without special glasses, allowing the examiner to observe the patient’s eyes during testing.

Each plate contains four random-texture patterns, with a hidden circular target in one pattern. The patient identifies the pattern containing the target. The depth effect is produced by printing the target and surrounding pattern on opposite sides of the plate, rather than using simulated stereoscopic images.

Three plates of different thicknesses support a stated stereoacuity range of 600 to 5 seconds of arc, depending on the plate and testing distance. A tape measure is included to control eye-to-plate distance during assessment.

The set includes three test plates, a storage box with a fold-down flap that provides a clear testing background, and a tape measure. It is intended for clinical stereopsis and binocular vision assessment, including pediatric, orthoptic, and ophthalmic use.