title: [Erythropsia in a patient with lens implant. Physiologic and electrophysiologic study].
abstract: A case of snow erythropsia is described in a patient with pseudophakia (Binkhorst four loop len). Symptoms of the condition lasted a week and allowed us to define psychophysic and electrophysiological findings. Morphoscopic night threshold was raised (0,28 b/hm 2). Resistance to glare was very low. In the study of colour vision, answers for Beyne's lantern lights were: pink orange for white; grey for blue; purple for red; red for orange; white for green. Ishihara and Farnsworth tests showed a defect of the red-green type. With the Nagel anomaloscope the matching of colours was normal (Rayleigh match). Electrophysiological study showed a low value of the standing potential of the eye and a normal electroretinogram. It seems that the colour defect in erythropsia is a glare phenomenon due to high luminance.
mesh_terms: D000221:Adaptation, Ocular; D000368:Aged; D003118:Color Perception / Q000502:physiology; D003119:Color Perception Tests / Q000379:methods; D004585:Electrooculography; D004596:Electroretinography; D005260:Female; D006801:Humans; D007910:Lenses, Intraocular / Q000009:adverse effects*; D008027:Light / Q000009:adverse effects; D012865:Skiing; D012914:Snow; D013472:Sunlight / Q000009:adverse effects; D014786:Vision Disorders / Q000209:etiology* / Q000503:physiopathology
vernacular_title: Erythropsie chez un porteur d'implant. Etude physiologique et électrophysiologique.