Probably only the first link is of general interest. The rest are fascinating while going through vision therapy.
Color Stereo ("Magic Eye") pictures by Gene Levine. If I put my face right up to these and then slowly draw back, sometimes I can see the 3D effect.
A Greek art design.
One with Kuan Yin.
Squinty Josh - Meet My Eyes. A wonderful blog about undergoing vision therapy with detailed explanations of some of the exercises and some of the underlying vision issues. I linked to the starting post.
squintyjosh.com. Two browser games that help the eyes work together, made by Josh and linked from his blog. Requires red/green glasses, which are often involved in vision therapy exercises. Space Owl reminds me a little of the old Space Invaders game. Spelling Bee has a moving octagon with words inside that are sometimes spelled correctly and sometimes not, where both eyes have to work together to see the order of the letters. Both games are carefully crafted.
Vision Therapy for Non-Strabismic Binocular Vision Disorders by David A. Damari. I didn't notice the "Non-Strabismic" part until today, but it's still an interesting breakdown of vision therapy techniques. I like the emphasis on, "Don't teach the test!" Make sure the patient is developing the underlying skills, not just getting better at the exercise used to test their vision.
Optometric Management of Patients with Incomitant Strabismus by David L. Cook. More interesting vision therapy techniques.
ETA: Forgot one!
How a movie changed one man’s vision forever by Morgen Peck. Maybe if you engage someone with 2 hours of 3-D movie and include monocular depth cues, it will wake up their 3-D vision like it did for this guy.