[Blepharoptosis: diagnostic tests].

The article discusses diagnostic algorithms for blepharoptosis in patients with Horner's syndrome, myasthenia, chronic progressive ophthalmoplegia, myotonic dystrophy, and acute neurovascular events. Basic methods for evaluating the upper eyelid position and ptosis severity as well as special pharmacologic stress tests to reveal the true etiology of the condition and make the best treatment choice are described.