Quick answer
Anaglyphs are red-blue filter glasses. The red filter lets one eye see only red targets and the blue filter lets the other eye see only blue targets, so each eye gets its own image while both stay open. Vision therapy uses them to train both eyes together instead of covering one eye with a patch.
Anaglyphs are filters that block out light from a portion of the target being viewed so that one part is visible by one eye and one part is visible by the other eye.
Anaglyphs (red/blue glasses) allow good control of stimulus parameters. As red filter is placed over right eye and blue over left eye, the right eye sees only red targets and left eye sees only blue targets thus viewing with both eyes simultaneously.
Conventional occlusion therapy, by patching the dominant eye to encourage stimulation of the amblyopic eye, is traditionally the mainstay treatment for amblyopia. Although effective, this simple intervention produces variable and unsatisfactory outcomes, long durations of treatment, high costs, negative psychological and emotional impacts, and poor compliance, which may even render the treatment completely ineffective.
Medically reviewed by Puneet (B.Optom, BNYS), Co-founder and CEO of CureSee, on 19 October 2026. This article is general information about eye health, not medical advice. Please talk to your eye doctor about your own eyes and treatment.