Hyde L L
J Am Intraocul Implant Soc. 1984 Winter;10(1):84-6. doi: 10.1016/s0146-2776(84)80093-2.
A simple device for evaluating the corneal astigmatism present at the conclusion of ocular surgery is described. Directing the coaxial light from the operating microscope through the ruler's round aperture will create an elliptical reflex from the cornea that indicates the presence of astigmatism. Successive apertures in the ruler present known elliptical light reflexes to the cornea, and the surgeon can select the aperture that converts the corneal reflex to a circular appearance. The dioptric marking of the aperture indicates the approximate value of the astigmatism on the cornea.
本文描述了一种用于评估眼科手术结束时角膜散光情况的简易装置。将手术显微镜的同轴光线通过尺子的圆形孔径投射到角膜上，会产生椭圆形反射，这表明存在散光。尺子上连续的孔径会向角膜呈现已知的椭圆形光反射，外科医生可以选择能使角膜反射变为圆形的孔径。该孔径的屈光度标记指示角膜上散光的近似值。
