Do cataracts have to wait until you can’t see? The answer is wrong. When cataract affects our visual quality, including visual acuity, contrast sensitivity and clarity, we can consider surgery. In the past, due to the level of medical technology and poor living standard of the residents, cataract surgery was often delayed until we could not see, which was risky and had many complications. There is no drug that can turn an already cloudy crystal into a transparent one, so we should not use it blindly.