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1 1-4Paradoxical Constriction of Pupils to Darkness (Flynn Phenomenon)Example of patients both with and without paradoxical constriction of pupils. Observed in many congenital retinal disorders, such as achromatopsia, congenital stationary night-blindness, and Leber’s congenital amaurosis. Sometimes seen in optic nerve disorders, such as dominant optic atrophy.Pupil; Flynn Phenomenon
2 Figure-27Pupillogram demonstrating paradoxical pupillary constriction to darknessPupillogram demonstrating paradoxical pupillary constriction to darkness in four patients with congenital achromatopsia. Note that the pupils initially constrict when the light is extinguished. (Price MJ, Thompson HS, Judisch GF et al: Pupillary constriction to darkness. Br J Ophthalmol 1981;69:205â...Color Vision Defects/congenital; Color Vision Defects/physiopathology; Dark Adaptation; Flynn Phenomenon; Humans; Infrared Rays/diagnostic use; Night Blindness/congenital; Night Blindness/physiopathology; Optic Nerve Diseases/physiopathology; Pupil/physiopathology; Retinal Diseases/congenital; Retin...
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