Suppression essentially refers to the brain ignoring the visual signal provided by one eye. It is the visual system’s method of compensating or adapting for a defect.
If one eye has a very blurry image ( which can be as a result of amblyopia or refractive error) the brain struggles to combine the images of each eye together into a single image. To compensate, the brain suppresses or ignores visual input from the blurry eye. This same concept occurs if one eye is turned (strabismus or squint), this will cause the brain to see multiple images, which would be confusing. Again, the brain suppresses (ignores) visual input from the deviating eye and utilizes input from the fixating eye.
Suppression is common in patients with amblyopia and strabismus (lazy eye).
You may not notice if there’s suppression in your vision until you visit an eye clinic and get a comprehensive eye examination.
This is one of the reasons why you should have a regular eye examination.
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