Artifacts in fusion and stereopsis testing based on red/green dichoptic image separation

J Pediatr Ophthalmol Strabismus. 1994 Sep-Oct;31(5):290-7. doi: 10.3928/0191-3913-19940901-05.


A red/green anaglyph stereotest (TNO) was administered to a group of patients who had anisometropic amblyopia, and the Worth 4-Dot test for fusion to two groups of strabismus patients. Both tests were administered twice, with the red/green lens position of the glasses reversed between eyes for the second administration. Twelve of 15 patients with anisometropic amblyopia exhibited a stereo acuity difference of 2:1 or more, and 18 of 89 strabismic patients changed Worth 4-Dot fusion or suppression status, between the two positions of the glasses. A group of seven strabismic patients who showed the reversal effect on the Worth 4-Dot test had the results of one glass' position discrepant with those of a geometrically identical achromatic test. It appears that the red/green format can introduce artifacts in binocular vision testing. Testing twice, with the red/green glasses reversed between trials, will prevent misinterpretation of binocular status and may provide diagnostically useful information.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adolescent
  • Adult
  • Amblyopia / physiopathology*
  • Artifacts*
  • Child
  • Child, Preschool
  • Depth Perception / physiology*
  • Flicker Fusion / physiology*
  • Humans
  • Light
  • Middle Aged
  • Ocular Motility Disorders
  • Reproducibility of Results
  • Strabismus / physiopathology*
  • Vision Tests / methods*
  • Vision, Binocular / physiology
  • Visual Acuity