在临床上,如果不借助于特别的光学系统,对于眼底周边部位的详细观察是难以可能的,因为当观察周边时的斜光束散光减低了眼底象的对比度和分解力。我们应用电子计算机计算了人广角光学模型眼的从后极部到各不同角度周边部的斜光束散光,即子午和弧矢的聚散度之差。我们的计算结果与以往其他学者的测量值基本相符。 Clinically, a detailed observation of the peripheral portion of the fundus is not possible without the aid of a special optical system, as oblique beam astigmatism when looking at the periphery reduces the contrast and resolution of the fundus image. We calculate the oblique beam astigmatism, ie, the difference between the meridional and sagittal vergence of the human wide-angle optical model eye from the posterior pole to the periphery of the various angles using a computer. Our calculations basically agree with those of other scholars in the past.