Strabismus

Strabismus, also known as "heterotropia", "squint", "crossed eye", "wandering eye", or "wall eyed", is a disorder in which the eyes do not point in the same direction. It typically involves a lack of coordination between the extraocular muscles which prevents bringing the gaze of each eye to the same point in space, preventing proper binocular vision, which may adversely affect depth perception. The cause of strabismus can be a disorder in one or both of the eyes. For example nearsightness or farsightness. Making it impossible for the brain to fuse two images.

Investigation

If the eye being tested is the strabismic eye, then it will fixate on the object after the "good" eye is covered.

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If it is the "good" eye, there will be no change in fixation, as it is already fixated.

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Depending on the direction that the strabismic eye deviates, the type of tropia or phoria may be assessed.

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