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Your Vision Therapy Glossary

vision therapy vocabulary

Quick Facts About Vision Therapy

  • An estimated 10 million children have vision problems.
  • Studies show that vision problems are a primary cause of reading difficulties in children.
  • In fact, approximately 20 percent of school-aged children may, to some degree, be affected by a vision-related learning disability.
  • The Snellen Chart is the standard chart used in eye exams; it was developed in the 1860s.
  • Vision therapy works well for both children and adults.
  • Traditional vision tests do not screen for learning-related vision problems.

For more information about vision therapy, please contact us to schedule an appointment.

Your Vision Therapy Glossary

Whether you are new to the world of vision therapy or are a seasoned pro, there’s no denying that there is a lot of information to take in. Here’s a quick glossary to help you understand the ins and outs of vision therapy.


Amblyopia involves poor muscle control in one eye and, generally, lowered visual clarity. The condition is sometimes referred to as “lazy eye.”

Binocular Vision

Also called eye teaming, binocular vision describes the use of both eyes simultaneously, in such a manner that each retinal image contributes to the final perception. Simply put, binocular vision is when your eyes work together equally and smoothly, and one eye does not have to work harder than the other to focus on an image or object properly.

Convergence Insufficiency

When you read or try to focus on an object, your eyes turn inward slightly to allow you to see a single image. Convergence insufficiency occurs when the eyes do not work together to focus. With convergence insufficiency, one eye may have a tendency to drift away from the target when doing close work.

Depth Perception

Depth perception is the brain’s ability to use visual information from one or both eyes to determine the spatial relationships between objects.


Diplopia is another term for double vision. If the two eyes are misaligned, they aim at different targets and project mismatched images to the brain. The brain accepts both these images and sees them at the same time, resulting in double vision.


With hyperopia, or farsightedness, an individual can see distant objects clearly, but closer objects appear blurry or out of focus.

20/20 Vision

Having 20/20 vision indicates that you can see at 20 feet what any average human with similar eyesight can also see at that same distance. Some people have vision that is better than 20/20; the term simply describes normal visual acuity, or clarity.


With myopia, or nearsightedness, an individual can see images or objects that are up close clearly, but they have difficulty seeing distant objects clearly.

Perceptual Skills

Examples of perceptual skills include visual memory, visual discrimination, the ability to discern spatial relationships, visual closure, visual/auditory integration, visual motor integration, directionality, laterability and bi-laterability.


Strabismus is sometimes referred to as having crossed eyes. The condition occurs when both eyes do not work together. As a result of poor eye muscle control, one eye turns in a different direction than the other.

Vision Therapy

Also called visual, or vision, training, vision therapy involves a personalized, supervised treatment plan that is designed to correct certain problems with how the brain and eyes work together, including problems relating to depth perception, visual acuity, hand-eye coordination, eye teaming, some learning disabilities and more.