This is a beta course, so its structure, chapters, and examples may continue to change.老视 (Presbyopia)This article is being translated. Please check back soon. Previous 散光 (Astigmatism) 视物重影？了解散光是如何影响视觉质量的。Next 验光与处方 了解验光流程，学会看懂验光单，选择合适的镜片。
