Binocular Vision Assessment

What is Binocular Vision Assessment?

A binocular vision assessment evaluates how well your two eyes work together to create a single, clear image. Binocular vision is when the brain uses information from both eyes to create a unified image.

It is done to assess depth perception, eye alignment, and eye coordination. These issues can impact reading, learning, and everyday tasks.

Why is the test done?

Binocular vision assessment helps detect various vision problems that could be missed in a routine eye exam. This includes issues with depth perception, coordination, and eye alignment.

Depth Perception: Binocular vision is necessary for judging distances and seeing the world in 3D. It allows you to identify the exact location of an object and tells you where you are in space. Conditions like strabismus (crosses eyes) or amblyopia (lazy eye) can affect depth perception and also be detected by a binocular vision assessment.
Eye Alignment: Proper alignment of both eyes allows for a single, clear image. Strabismus is the most common cause of misalignment in the eyes.
Eye Coordination: This assessment checks how well your eyes move together smoothly and accurately. Injuries or neurological disorders such as traumatic brain injury or multiple sclerosis can impact eye coordination.

How is the test done?

A binocular vision assessment includes multiple tests to identify multiple problems. Cover Test: One eye gets covered while the movements of the uncovered eye are observed

Motility Assessment: Observe how well the eyes move together in different directions, looking for smoothness, accuracy, and range of motion
Phoria and Tropia Assessment: The eyes drifting out of alignment when not focused is Phoria while Tropia is when both eyes don’t point to the same object at the same time.
Stereo tests: The measurement of depth perception by using targets of varying degrees of depth.
Accommodative testing: Evaluates the eyes' ability to focus on different distances
Vergence testing: Assessment of the eyes ability to move inward and outward to maintain single vision
Near point of Convergence: Measurement of how close the eyes can come together before one drift outwards and blurs
Fusion: To determine how well your brain combines images from both eyes
Smooth Pursuit and Saccades: Assessment of the eyes ability to smoothly track a moving target and make quick jumps between multiple targets

Duration

The complete assessment requires 30 – 40 minutes. A more detailed assessment may take 90 – 120 minutes.

Treatment

Most problems with binocular vision can be treated by an optometrist with glasses and/or vision therapy.

The glasses that are given are prism lenses. These change the way light hits the eyes to help correct misalignment.

During vision therapy, a set of eye exercises are given to improve issues with the eyes including eye teaming skills, eye muscle strength, and the way the eye and brain work together. Vision therapy can also be tailored to address certain issues like excess convergence.

In extreme circumstances when all other treatments have failed, surgery is considered an option.

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