The body cells are regionally different in which they die and are re-born. For example, the stomach wall is regenerated within two days to adjust to stomach acid for the digest. And our skin regenerates over 2~3 weeks and our bones take about ten years for regeneration. But, the eye cells use the cells at birth for life. That means is that the eyes are impossible to regenerate. The fact that the near-sightedness rate in Asia, which uses a lot of artificial lighting, especially fluorescent lights, is very suggestive. Especially, the Chinese government has quickly propose to overcome the problem.
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