After the cataract enters the mature stage, because the lens clouding has been more sufficient, so, the vision loss is very obvious in this stage, individual vision will even fall to 0.1 or less. For this stage of cataract, early surgical treatment is recommended, and it is more suitable for surgery, the nuclear hardness will not be too large, so the energy used in the surgery is not too large, postoperative corneal edema, uveitis reaction is relatively mild, so the recovery is faster. If you still do not go to surgery at this stage, when you enter the overripe stage, because the lens becomes swollen, so, there may be secondary glaucoma symptoms, that is, the eye not only vision loss, but also eye swelling, headache, nausea, vomiting. After a long time, once the optic nerve atrophy is formed, even after cataract surgery, it is difficult to restore the vision to normal.