Ptosis may be secondary to:
a. paresis of a branch of cranial nerve III.
b. hyperthyroidism.
c. psoriasis.
d. blepharitis.
A
Ptosis is caused by a congenital defect of the muscle around the eye controlled by cranial nerve III. Hyperthyroidism causes exophthalmos. Psoriasis is a skin condition. Blepharitis is inflamma-tion of the eyelid.
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