显微定量角膜检查镜的研制

本文介绍一种新型角膜检查镜。其原理是根据等量交叉柱面透镜的合成原理制成可变量合成圆柱面透镜,合成柱面透面的轴向不变,并结合暗亮相间的同心圆环和分划板透射照明的角膜反射像形状的调整观察,可定量测量角膜表面的散光度和轴的方向。本角膜检查镜可用于手术显微镜下眼内手术时角膜散光检测的便携式角膜检查镜,在工作距离0．025m时,可测量的角膜散光度数可达8．50D,测量误差〈0．20D。显微定量角膜检查镜结构简单、方便准确,有助于对术眼角膜的散光度数和轴向进行检测和调整。

Design of a quantitative keratoscope used for ocular microsurgery

A new quantitative keratoscope used specially for ocular microsurgery to measure corneal astigmatism is reported. A combined cylinder-lens, which power can be changed by rotating lens in antidirection equally, was designed according to the principal of the crossing cylinder lens. The axis direction is fixed when the lens is rotated. The corneal astigmatism can be measured by changing the power of the combined lens to adjust the corneal ring images. The keratoscope could be used to measure the corneal astigmatism quantitatively specially for ocular microsurgery. At the work-distance of 0. 025 m, the maximum power of measured astigmatism was up to 8. 50 D. The error of the measurement was less than 0. 20 D. The keratoscope is a portable lens to be used easily during the ocular microsurgery. The reporting keratoscope is a simple combined cylinder-lens that can be used to measure corneal astigmatism, including the power and the axis of astigmatism, easily during ocular microsurgery.