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.
There are several pigmented moles inside the eye but a choroidal nevus is the one that demands the most scrutiny. Choroidal locates the freckle to a layer of tissue underneath the retina â nevus means a benign growth of pigmented cells. Most choroidal nevi are safe and are managed with periodic exams. A small percentage of these nevi, however, can grow and become a choroidal malignant melanoma.