A Complete Collection of 100000 Whys
Fav十万个为什么
南极为什么不属于任何国家？
近视的原理主要是由于眼球前后径过长或晶状体曲度过大、导致光线聚焦在视网膜前方、形成模糊的像，具体如下：
1、眼球前后径过长：在近视眼中，眼球的前后径（即从角膜到视网膜的距离）比正常眼球要长。这使得进入眼睛的平行光线在到达视网膜之前就已经会聚，焦点落在视网膜前方，导致视网膜上形成的像是模糊的。
2、晶状体曲度过大：除了眼球前后径过长之外，近视还可能由于晶状体的曲度过大（即晶状体太厚或弹性过强）引起。这同样会导致光线在进入眼睛后会聚得过快，焦点落在视网膜前方，造成视网膜上成像模糊。
3、角膜曲率过大：角膜是眼球的前部结构，它的曲率也会影响光线的折射。如果角膜的曲率过大，也会导致光线在进入眼睛后会聚得过快，形成近视。
总结：近视的原理主要是由于眼球前后径过长或晶状体曲度过大、导致光线聚焦在视网膜前方、形成模糊的像。
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