Symptoms depend on which muscles are affected. For example, when weakness affects muscles of the chest, people may have difficulty breathing. When weakness affects muscles that control the eyes, people may have double vision. Complete muscle weakness causes paralysis.
The choroid is the layer of blood vessels and connective tissue between the sclera (white of the eye) and retina. It is part of the uvea and supplies nutrients to the inner parts of the eye.
Choroidal Melanoma. Choroidal melanoma is the most common primary intraocular (occurring inside the eye) tumor in adults. It arises from the pigmented cells of the choroid of the eye and is not a tumor that started somewhere else and spread to the eye.