It might be adult strabismus. Strabismus is when your eyes are not lined up properly and they point in different directions. One eye may look straight ahead while the other eye turns in, out, up, or down. Strabismus affects vision, since both eyes must aim at the same spot together to see properly. To line up and focus both eyes on a single target, all muscles in both eyes must be balanced and working together. The brain controls these muscles. People who have strabismus usually have a problem that can affect eye muscles. Some of those problems may include:
- Health problems such as diabetes, thyroid disease (Graves’ disease), Myasthenia gravis, brain tumors, or a stroke
- Accidents or head injury
- Damage to eye muscles during some kind of eye surgery
For the treatment, you need consult an ophthalmologist about the potential causes. The common treatments include adult strabismus surgery, eye muscle exercises or prism eyeglasses.