By definition a cataract is an opacity in the lens. For practical purposes, however, the term is only applied to those opacities of the lens that impair sight.从定义上讲,(白)内障是晶状体中不透明...
By definition a cataract is an opacity in the lens. For practical purposes, however, the term is only applied to those opacities of the lens that impair sight.
Classificati...