目前没有研究显示为什么大量阅读会导致这一结果，但是由于长时间聚焦近处的物体需要眼部肌肉持续收缩以保证视网膜保持需要的形状，因此这种眼肌的持续收缩状态可能会使眼球受到拉伸，长期如此，其原有形状可能会被永久地改变，从而导致近视产生。

But focusing on close objects involves contraction of muscles controlling the shape of the eye's lens. And one possibility is that "this constant contraction may stretch the eyeball.

youdao

All right. Last time we started asking ourselves about what are some of the other aspects of death that might contribute to its badness, or at least other features of death that are worth thinking about.

好了，上一次我们开始自问这样一个问题,死亡还有什么其他的方面,可能导致其坏处的原因，或者至少是其他值得思考的死亡的特征。

耶鲁公开课 - 死亡课程节选