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Double vision is also called diplopia , which causes a person to see two images of a single object. Diplopia is the medical term for double vision. It is the simultaneous perception of two images of a single object and the displacement may be horizontally, vertically or diagonally. Double vision is one of the most troublesome visual disorders a patient can experience. Double vision can be due to the result of impairment in any part of the vision system, including the cornea, eye muscles, lens, nerves, or the brain. It usually occurs when the eyes, that are previously worked together as a pair, is no longer able to do so because a squint has developed and the eyes are now out of alignment with each other, resulting in double vision and this may happen suddenly or over a period of time. Double vision is a symptom of strabismus.
Misalignment of the two eyes due to functional problems in the visual system
A structural defect in the eye's optical system
Eyes appear as crossed, misaligned, or wander eye.
Treatment of double vision depends on its cause. If the double vision is present most of the time, then it may be possible to use a Fresnel prism on the person's own glasses to join the double vision. The treatments include:
Wearing glasses with filters
Having an eye patch over one eye
Receiving a botulinum toxin injection for one of the eye muscles