What causes double vision in one eye

Hello Anon

Thank you for writing.

Double vision in one eye is known as monocular double vision. Double vision continues when the unaffected eye is covered, but you should be able to see normally when the affected eye is covered.
It can be caused by:
-an irregularly shaped cornea (astigmatism), which is a refractive error
dry eye, which is when your eye does not produce enough tears
-abnormalities of the cornea
-abnormalities of the lens, such as cataracts (cloudy patches over the lens)
-abnormalities of the retina, such as macular degeneration

The cornea is located at the front of the eye and acts like a camera lens, helping to focus the light coming into the eye.
The retina is a light-sensitive layer of tissue at the back of the eye that converts light entering the eye into electrical signals.

Your doctor can help you further.
Best,
Susan