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A new method for evaluation of accommodative convergence Ken Asakawa 1 , Hitoshi Ishikawa 1,2 , Nobuyuki Shoji 1,2 , Kimiya Shimizu 3 1Dept of Vis Sci, Kitasato Univ Grad Sch, Masters Program of Med Sci 2Dept of Rehab, Orthoptics and Vis Sci Course, Kitasato Univ Sch of Allied Health Sci 3Dept of Ophthalmol, Kitasato Univ Sch of Med pp.569-573
Published Date 2007/4/15
DOI https://doi.org/10.11477/mf.1410101737
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Abstract. Purpose:To describe our new method for evaluation of accommodative convergence and to assess its clinical usefulness. Cases and Method:Fifteen healthy volunteers were tested with the new method. The series comprised 5 males and 10 females. Their age ranged from 18 to 22 years, average 21 years. They underwent gradient test to measure AC/A ratio. An infrared CCD camera was used to measure the shift of Purkinje first image. Results:Under accommodative stimulus of 3 diopters(D), AC/A ratio averaged 1.18Δ by far gradient method and 2.25Δ by near gradient method. The Purkinje image shifted by 0.13mm/D by far gradient method. This value was positively correlated with AC/A ratio. Conclusion:Measurement by infrared CCD camera is easy and allows objective measurement of accommodative convergence. It promises to be of clinical value.


Copyright © 2007, 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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