are often problematic if the degree of muscle weakness, and therefore ocular misalignment, fluctuates frequently. Epidemiology In contrast to generalized MG, purely ocular MG occurs equally among females and males, has a higher incidence in persons of Korean descent, and is likely associated with thyroid disease, thymomas (20% incidence), and other autoimmune diseases such as scleroderma, systemic lupus erythematosus, rheumatoid arthritis, Hashimoto's thyroiditis, multiple sclerosis, and thyroid ophthalmopathy. Notes References Spector RH. Ocular Myasthenia Gravis Article Autoimmune diseases Eye diseases