title: A simple diagnostic test for pupillary abnormality in diabetic autonomic neuropathy.
abstract: A simple portable pupillometer using Polaroid photography has been developed for use in the diagnosis of diabetic autonomic neuropathy. The pupil diameter per cent (PD%), defined as the percentage of iris diameter to which pupil diameter had dilated in darkness, was measured from the instant colour prints. An age-related normal range was constructed from measurements in 163 healthy subjects in whom PD% declined linearly by 3% per decade. The PD% was measured in 15 patients with automatic neuropathy and 12 were identified with abnormally low values indicating a failure of sympathetically mediated dilatation. Results were consistent with the standard television pupillometric technique and had the same high repeatability with a coefficient of variation of 3.2%.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D001342:Autonomic Nervous System Diseases / Q000175:diagnosis* / Q000503:physiopathology; D003624:Darkness; D003929:Diabetic Neuropathies / Q000175:diagnosis* / Q000503:physiopathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010781:Photography / Q000295:instrumentation; D011680:Pupil / Q000502:physiology* / Q000503:physiopathology; D012016:Reference Values; D013564:Sympathetic Nervous System / Q000503:physiopathology