Raasch T W
Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
Optom Vis Sci. 1995 Apr;72(4):272-5. doi: 10.1097/00006324-199504000-00008.
Understanding the relation between refractive error and visual acuity is complicated if astigmatic blur is present. No models are in widespread use that allow the combination of spherical and astigmatic errors for the purpose of predicting visual performance.
Models for combining spherical and astigmatic errors are discussed, and predictions of these models using data from the literature are presented.
Three models for combining astigmatic with spherical errors are shown to predict visual acuity performance in uncorrected myopic refractive errors. A dioptric vector addition model is shown to have advantages over other candidate models.
It is possible to combine spherocylindrical refractive errors into a single value when the objective is to correlate these values with visual acuity performance.
如果存在散光性模糊，那么理解屈光不正与视力之间的关系就会变得复杂。目前还没有广泛使用的模型能够将球镜和柱镜度数相结合以预测视觉表现。
讨论了将球镜和柱镜度数相结合的模型，并展示了使用文献数据对这些模型的预测结果。
三种将柱镜与球镜度数相结合的模型被证明可以预测未矫正近视性屈光不正的视力表现。一种屈光度矢量相加模型被证明比其他候选模型具有优势。
当目标是将这些值与视力表现相关联时，可以将球柱镜屈光不正合并为一个单一值。
