Sekine A, Minegishi I, Koizumi H
Technical Research Group, Topcon Corporation, Ltd., Tokyo, Japan.
J Opt Soc Am A. 1993 Jul;10(7):1651-5. doi: 10.1364/josaa.10.001651.
A simplified noncontact measuring technique for axial eye length was developed. According to this method, the wavelength shift of a single-mode laser-diode beam that is irradiated onto the eyeball causes a phase shift in the interference fringes of reflections from the retina and the cornea. Then the optical distance between the cornea and the retina is obtained from the phase-shift measurement. High-speed axial eye-length measurements can be performed by using a laser diode on a pulse-modulation drive and signals from the reference light path as an analog-to-digital-conversion trigger. Compared with the technique that uses partially coherent light, this technique is inferior in terms of measurement accuracy but superior in its wide, measurable range of 16-32 mm. The results of measurements of 21 adults showed that 2 standard deviations of measurement was 2 sigma = +/- 0.11 mm.
开发了一种用于测量眼轴长度的简化非接触测量技术。根据该方法，照射到眼球上的单模激光二极管光束的波长偏移会导致来自视网膜和角膜反射的干涉条纹产生相移。然后通过相移测量获得角膜与视网膜之间的光学距离。使用脉冲调制驱动的激光二极管并将来自参考光路的信号用作模数转换触发器，可以进行高速眼轴长度测量。与使用部分相干光的技术相比，该技术在测量精度方面较差，但在16 - 32毫米的宽可测量范围内表现更优。对21名成年人的测量结果表明，测量的2倍标准差为2σ = +/- 0.11毫米。
