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The Hirschberg conversion ratios of 149 normal eyes estimated with video-based technique Satoshi Hasebe 1 , Hiroshi Ohtsuki 1 , Takashi Furuse 1 , Reika Kouno 1 , Tsuyoshi Tanaka 1 , Yumiko Okada 1 1Dept of Ophthalmol, Okayama Univ Med Sch pp.1743-1746
Published Date 1996/10/15
DOI https://doi.org/10.11477/mf.1410905073
  • Abstract
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To verify the reliability of the Hirschberg measurement, the Hirschberg conversion ratios of 149 normal eyes were investigated using a video-based technique. The ratios were almost normally distributed and the mean±S.D. value was 12.3±1.2 degrees/mm (21.8±2.1prism diopters/mm), and the range was from 9.9 to 15.6 degrees/mm. There was a negative correlation (r=-0.5) between the conversion ratio and the radius of anterior corneal surface. Neither the refractive errors nor the ages of the subjects affected the conversion ratio significantly. Although the mean conversion ratio we found corresponded to the theoreti-cally predicted value, intra-subjective variation of the conversion ratio can make a serious systematic error in the estimation of the strabismic angle in cases where the mean conversion ratio was applied to all subjects.


Copyright © 1996, 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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