The syndrome of chronic progressive external ophthalmoplegia has been generally regarded as denoting an ocular myopathy. Recent evidence is presented, however, which both denies the universality of a myopathic etiology and demonstrates our present inability to distinguish between myopathy and neural weakness of ocular muscles.
Daroff RB. Chronic Progressive External Ophthalmoplegia: A Critical Review. Arch Ophthalmol. 1969;82(6):845–850. doi:10.1001/archopht.1969.00990020837022
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