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.
1 The iris is the colored part of the eye (most often blue or brown). 2  It surrounds the pupil, the small opening that lets light enter the eyeball. 3  The choroid is a thin, pigmented layer lining the eyeball that nourishes the retina and the front of the eye with blood.ntraocular melanoma (melanoma of the eye). Intraocular melanoma is the most common type of cancer that develops within the eyeball in adults, but it is still fairly rare. Melanomas of the skin are much more common than intraocular melanomas.