More than 4000, but improper treatment can lead to dry eye, which is incurable and a very difficult problem. If you don't use your eyes properly after laser myopia, you will return to the state of myopia before. Diet, eat more animal liver, eggs, carrots and so on. Strengthen physical exercise. It is necessary to correct sitting posture and adjust reading distance. It is suggested that two cups of Zheng Jiuwei Pupil Tea every day can relieve eye fatigue, make eye blood circulation smooth, give eyes enough oxygen and give them a good rest.