What causes double vision?!
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There are two possible causes. Refractive. Light from an object is split into two images by a defect in the eye’s optical system. Cataracts might, for example, cause such a defect.
Failure of both eyes to point at the object being viewed, a condition referred to as "strabismus" or "squint". In normal vision, both eyes look at the same object. The images seen by the two eyes are fused into a single picture by the brain. If the eyes do not point at the same object, the image seen by each eye is different and cannot be fused. The result is double vision. Why might eyes not point in the same direction? Possibly because of a defect in the muscles which control the movement of the eyes or in the control of these muscles through the nerves and brain.
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Double vision, medical term as diplopia, can be either monocular or binocular.
Monocular diplopia is double vision in only one eye. The double vision continues even when the other eye is covered. The underlying cause can be cataract, astigmatism (abnormal curvature of cornea), keratoconus, pterygium (thickening of the conjunctiva), dislocated lens, and mass lesion in eyelid.
Binocular diplopia is double vision related to misalignment of the eyes. The double vision disappears if either eye is covered. The underlying causes include strabismus, damage to nerves controlling the extraocular muscles, diabetes, Myasthenia gravis, Graves' disease, trauma to the eye muscles.
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