Basically, when the eye grows too long the light inside the eye comes to a focus in front of the retina rather than at the retina, causing blurry vision, so we must wear glasses to change the optics and focus the light onto the retina again. 是这样的，如果眼睛的前后距离太长，眼睛里的光线就会聚焦在视网膜前面而不是视网膜上，从而造成了模糊的视觉，因此，我们必须戴上眼镜来改变光线的路径，使它再次聚焦到视网膜上。 When we age, we suffer a different process. Our tissues become stiffer and the lens doesn't adjust as easily so we start to lose near vision as well. 随着年龄增长，我们会经历一个不同的过程。我们的眼部组织会变得僵硬，晶状体的活动性也变差，渐渐地，我们就连近的东西也看不清了。