Loshin D, Fry G
Am J Optom Physiol Opt. 1976 Mar;53(3):124-36. doi: 10.1097/00006324-197603000-00005.
A procedure has been developed for tracing a bundle of rays through and ophthalmic lens and a schematic eye with its primary line of sight pointed through various parts of the lens. A bundle of eight rays can provide data for assessing the quality of the image formed by such a system. To test the procedure and to generate data which can help in selecting a method for evaluating image quality, we selected a single lens as an example. The lens selected has a spherical back surface (-5.00 diopters) and a toric front surface (+15.00 diopters in the vertical and /10.00 diopters in the horizontal). It has a center thickness of 5 mm and glass of index 1.523. Spot diagrams were generated with the eye pointed in various directions through the ophthalmic lens. The data generated showed that peripheral bundles which fall between the principal meridians emerge as astigmatic bundles. This leads to the proposal that blur circle theory can be used for evaluating the quality of the optical image and that it suffices in the case of a spherocylindrical ophthalmic lens to base the tolerances for refractive power on measurements made in the principal meridians.
已开发出一种程序，用于追踪一束光线通过眼科镜片和一只模型眼，其主视线指向镜片的各个部位。一束八束光线可为评估此类系统形成的图像质量提供数据。为了测试该程序并生成有助于选择图像质量评估方法的数据，我们选择了一个单镜片作为示例。所选镜片的后表面为球面（-5.00屈光度），前表面为复曲面（垂直方向为+15.00屈光度，水平方向为/10.00屈光度）。其中心厚度为5毫米，玻璃折射率为1.523。通过将眼睛指向不同方向穿过眼科镜片生成了点列图。生成的数据表明，落在主子午线之间的周边光束会以像散光束的形式出现。这导致有人提出，模糊圆理论可用于评估光学图像的质量，并且对于球柱面眼科镜片而言，基于在主子午线处进行的测量来确定屈光力公差就足够了。
