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A pedigree with incomplete tritanopia Hiroshi Ichikawa 1 , Yozo Miyake 1 , Kazuo Ichikawa 2 1Dep. of Ophthalmol., Nagoya Univ. Sch. of Med. 2Dept. of Ophthalmol., Chukyo Hosp. pp.579-583
Published Date 1985/5/15
DOI https://doi.org/10.11477/mf.1410209422
  • Abstract
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We observed a family with tritanopia affecting three members : a 35-year-old female, her sister aged 33 years and their father aged 66 years. Each of the three cases had normal visual acuity. They manifested pure tritanopic findings and were free of red-green defects when tested with various color vision tests. No pathological fundus findings were observed in the affected and unaffected family members. These findings led to the conclusion that the tritanopia in this family was decidedly hered-itary and was of dominant autosomal nature.

One of the three cases showed normal ERG and non-recordable blue ERG under background illu-mination. Psychophysiological studies made on the proband demonstrated no detectable blue cone response without π component, or Stiles' n mecha-nism. The findings were suggestive of underlying defective functions in the blue cone system following loss of interreceptoral interraction between the blue cone and the longer wavelength sensitive red and blue cones.


Copyright © 1985, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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