How is thickening of the retina treated?

Depends: It depends on the cause. Sometimes there is swelling of the retina. It can occur after cataract surgery and other conditions such as macular degeneration. It can sometimes be treated with eye drops or special injections. Sometimes membranes form on the surface of the retina that thicken the retina and it can pull and distort it. Any thickening of the retina can cause decreased vision.

Macular edema: Thickening of the retina can happen from different causes, including diabetes, vein occlusions, among other causes. Treatment varies based on underlying cause/severity.