4D Vision Gym

Stereo Blindness

3D Stereo Vision,
How Stereo Blindness Affects More Than
Watching 3D Movies

Stereo blindness results when the eyes don’t work together.

3D stereo vision, or stereopsis, describes the depth sensation of successfully merging two pictures that are slightly different into one image. When the eyes don’t create one 3D image by working together, the resulting condition is stereo blindness.

Are you aware that stereo blindness affects much more than the ability to enjoy a 3D movie?

Stereo blindness can affect your ability to play sports, like baseball, and read.

This condition, often affecting the way that the eyes and brain work together as a team, can negatively affect athletic performance causing a child with this condition to have trouble playing sports. In fact, many parents don’t realize that their son or daughter is having a problem until they see the child playing organized sports.

Like many other children with visual development problems, the child will track the ball with only one eye, moving his head, and frequently missing. Both on the field and off, he will feel ashamed that he cannot keep up. The good news is that if this condition is diagnosed early, it is correctable.

A functional vision evaluation, performed by an behavioral optometrist, is needed in order to diagnose problems like stereo blindness. Without a comprehensive eye exam, doctors are not able to get a complete picture of the problem. Worse, many parents, and even public school teachers, do not know what to look for.

Typically, the child’s performance on the field is poor, and the child keeps making the same mistakes, both at bat and in the outfield.

The prescribed vision therapy frequently consists of weekly sessions with a behavioral optometrist or a vision therapist, under the supervision of an optometrist. This therapy may last several months. The patient will be instructed to perform daily practice exercises, usually lasting 15-30 minutes each day, in order to correct for the fact that the eyes and brain are not working together as a team. Drawing lines and circles, tracking moving objects, and developing peripheral vision skills to force the image processing centers in the brain to work together in tandem with the eyes.

To perform the eye teaming exercises, patient with 3D stereo blindness will require vision therapy which will include wearing 3D glasses and thick, yoked prisms that resembled coke-bottle glasses in order to develop spatial localization. The duration of treatment will depend on the patient’s condition.

By the end of his vision therapy sessions, the child is expected to throw and catch the baseball with improved accuracy and consistency. His batting average should improve tremendously, and he should hit the ball better and farther.

Many vision therapy patients are able to see results within a few weeks. The behavioral optometrist will not only diagnose the problem, but will develop a vision therapy program that goes right to heart of the problem. While the daily exercises will take time out of the child’s day, the results were undeniable.

Thousands of youngsters who do vision therapy receive some type of help with reading, athletics, with most seeing some marked improvement. Many take up reading long books for the first time, while others see positive changes in their personality.

Parents who notice that their child tilts their head to the side or closes one eye when reading–or who suffer headaches or rub their eyes while staring at the blackboard–should see an optometrist who specializes in developmental optometry right away. Other symptoms can include frustration, trouble focusing, headaches, or an inability to read for more than 20 minutes at a time.

With optometric vision therapy you or your child will be able to use 3D stereo vision and see in a whole new way.

Read Matt’s story and learn how he was able to experience 3D for the first time as an adult because of vision therapy.


Are You Sure You’ve Got Stereo Vision?
It’s hard to know what you’re missing, if you’ve never had it. Do you see with both your eyes? Are your two eyes similar or different in sight?

This Is Just A Test — of Your Stereo Vision System

Are both your eyes turned on and working together as a team? Try this easy test and find out if you are a good candidate for 3D viewing. It’s The Framing Game and it only takes a minute!y.


In order to see 3D your brain has to use the visual information from both eyes. If the two eye views are too different and cannot be matched up, the brain will be forced to make a choice. It will reject all or part of the information from one eye. The brain can suppress or turn off visual
information it cannot use. The Framing Game can tell you whether both your eyes are TURNED ON at the same time. The illustration to the left demonstrates what should happen.

  • Center your nose over the brown eye on the right.
  • Focus your eyes on the single brown eye.
  • Put your free thumb in front of your nose.
  • Continue to focus on the eye. If both eyes are on, you will see two thumbs framing one eye.
  • Now, switch your focus to your thumb. You should see two eyes framing one thumb.


Both your eyes are ON and you are an excellent candidate for 3D viewing fun.


Follow the instructions again and pay close attention to where you’re focusing your eyes.
If you wear lenses, try it without them.
Can’t see two thumbs (or two eyes)? Or does one thumb disappear and reappear? Or does one thumb appear faint — like a ghost image? You may want to consider having a comprehensive eye examination which includes the testing of binocular vision. To locate a vision care professional in your area, consult the Directory of Vision Care Providers
Don’t give up. You don’t have to have perfect binocular vision to attempt 3D viewing. Viewing the 3D images at this site can reinforce and strengthen your binocular skills. Learn about how eye doctors use 3D images to improve vision.
Please note: In-office therapy under the direction of a behavioral optometrist using prisms, filters and lenses, as used with our patients, is far more effective than home-based therapy.

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