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Some causes of double vision, medically known as diplopia, are dry eye, corneal infection or scars, injuries, cataracts and benign or malignant tumors. Another cause of double vision is weak eye muscles, which may be the result of illnesses, such as myasthenia gravis or...


Double vision in a single eye can be caused by cornea problems, lens problems and eye muscle problems, according to WebMD. Additionally, this problem may also occur when the brain fails to combine images from the eye due to damage of the nerves.


Double vision occurs when the vision system is experiencing problems with the cornea, the muscles in the eye or autoimmune disorders, according to WebMD. People with nerve conditions or brain problems may also experience double vision.


Doctors treat double vision, or diplopia, based on its underlying cause, notes WebMD. They may recommend surgery for weak or pinched eye muscles or prescribe medications to treat double vision due to myasthenia gravis. Doctors treat diabetics who suffer from double visi...


Causes of black spots in vision and other types of eye floaters include age-related vision changes, retinal tears, posterior uveitis and bleeding in the eye, according to Mayo Clinic. The floaters appear to drift across the eye and are difficult to look at directly.


Some symptoms of vision problems are halos around lights, fading or yellowing colors, double or triple vision, and glare, says WebMD. The cause of these symptoms may be developing cataracts. Symptoms of sudden flashing lights and floating black spots are caused by retin...


A person with 20/15 vision can see an object from 20 feet away with the same acuity as a normal person would at 15 feet away. Technically, then, a person with 20/15 vision has better than perfect vision.