Blurring of the eyes in middle-aged people can be attributed to many diseases, the more common ones are as follows: the first one is refractive error, such as myopia, hyperopia or astigmatism, which can be improved by wearing glasses. The second is presbyopia, which is a degenerative condition that can be improved by wearing presbyopic glasses to avoid eye fatigue. The third one, mainly seen in cataracts, may lead to premature cataracts if there are chronic underlying diseases such as diabetes in the whole body, which may lead to the loss of vision. In the case of very significant vision loss, surgical treatment can be considered to improve vision.