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Vision Conditions

Learn more about the visual system and vision conditions.
3D/Stereo Vision
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Stereo VisionStereo Vision or stereopsis is also referred to as 3D vision. Stereopsis, from stereo meaning solidity, and opsis meaning vision or sight, describes the sensation of depth attained from the successful merging of the two slightly different pictures seen in each eye into one 3D image. The condition of stereo blindness occurs when two eyes do not work together to create one 3D image.

Treatment for Stereo Blindness

Patients with stereo blindness require optometric vision therapy, including the use of prisms and 3D glasses. Treatment duration will depend upon the particular patient's condition and associated factors.

Locate a Doctor in your area who is experienced and knowledgeable in diagnosing and treating 3D vision problems

3D Vision & Eye Health A joint effort by the American Optometric Association (AOA) and the 3D@Home Consortium, this organization provides information about 3D vision.

Watch a video on 3D vision from an episode of 'The Doctors'

Adults Benefit from Vision Therapy

Neurobiologist Talks about Vision Therapy
Dr. Susan R. Barry is a professor of neurobiology in the Department of Biological Sciences at Mount Holyoke College and the author of Fixing My Gaze. Also available in audio book.

Dr. Barry was cross-eyed as a baby, but three childhood surgeries made her eyes look straight. Her doctors thought she would never gain stereo vision - the ability to see in three dimensions. Then, at age 48, Dr. Barry consulted a developmental optometrist who prescribed a program of optometric vision therapy, which taught her to see in stereo.

Dr. Barry's Articles

Why Can't My Child Read?
Neurobiologist finds adult brain is quite flexible

From 2D to 3D: How One Scientist Learned to See

Dr. Barry's Interviews

Read about and listen to Dr. Barry's interview on NPR
Read the interview Dr. Barry and a COVD member
Read the interview by the Review of Optometry

Dr. Barry's Videos

PBS Nova: The Secret Life of Scientists

Dr. Barry was featured in an article in The New Yorker by neurologist, Oliver Sacks, MD in June, 2006.

Read "Stereo Views" by Dr. Sue Barry
Read Oliver Sacks, A Neurologist's Notebook, "Stereo Sue,” from The New Yorker

NPR's Joe Palca Looks to Vision Therapy

NPR's Joe Palca was born with a crossed eye. His young brain learned to turn off the input from his turned in eye, unfortunately leaving Joe with no 3D vision. Joe met with optometrists at the University of California, Berkeley, where he was diagnosed by Dr. Dennis Levi as stereo blind. Joe contacted Dr. Sue Barry, who also had amblyopia as a child that caused her stereo blindness. Now he is working to gain stereo vision, and teaching his old brain new and better ways to see.

Read and listen to the NPR story on Joe Palca


Locate a Doctor in your area who is experienced and knowledgeable in diagnosing and treating 3D and stereo vision problems.

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