Calibration of Hirschberg test photographs under clinical conditions.
Calibration of Hirschberg test photographs under clinical conditions.
复制标题
临床条件下 Hirschberg 测试照片的校准。
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
S. Brodie
中科院分区：
文献类型：
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作者：
P. Derespinis;E. Naidu;S. Brodie
评估了从临床照片中确定眼偏斜角度的可行性。使用居中的电子闪光灯，从30名斜视患者和5名正眼对照受试者中获得角膜反射照片，并将毫米尺放置在前额上进行校准。角膜反射位移的测量从照片中获得，并与标准棱镜盖的结果进行比较。角膜反射位移转换为斜视角的转换因子为每毫米角膜反射位移20.89棱镜屈光度。赫希伯格系数的这个值仅适用于沿真实额面沿着反射位移的测量，如照片所示。附录中提供了从摄影数据计算斜交角的详细算法。
The feasibility of determining the angle of ocular deviation from clinical photographs was assessed. Corneal reflex photographs were obtained from 30 strabismic patients and 5 orthophoric control subjects, using a centered electronic flash, with a millimeter ruler placed across the forehead for calibration. Measurements of corneal reflex displacement were obtained from the photographs and compared with standard prism-cover results. The value of 20.89 prism diopters (PD) per millimeter of corneal reflex displacement was obtained for the factor of conversion from reflex displacement to strabismic angle. This value of the Hirschberg coefficient is valid only for measurements of reflex displacement along a true frontal plane, as provided in a photograph. Detailed algorithms for the calculation of strabismic angle from photographic data are provided in an appendix.