1, glare and night vision impairment: If the myopia degree is 700- 1000 degrees or above, 80% people will have dizziness and low light at night, and 25% people will have vision problems at night. This is mostly due to the fact that the operation area is close to the visual center during the operation.

2. Dissatisfied with corrected vision: After operation, the degree of correction may be insufficient, not as expected, or over-corrected, and hyperopia, that is, presbyopia, may be advanced.

3, dry eye: surgery may hurt the tear film nerve, so that tear secretion is reduced.

4. Pseudokeratoconus: an extreme problem after surgery. This is caused by cutting too deep, which will make your eyesight worse. Fortunately, the probability of occurrence is very low.

Extended data:

1, type:

(1) femtosecond laser;

Including femtosecond laser LASIK (commonly known as semi-femtosecond), 20mm incision, clinical use since 2006, painless surgery, need to do corneal flap, but not suitable for patients with dry eyes, astigmatism, thin cornea. Because of the large incision, it is not as good as full femtosecond smile to protect corneal structure.

(2) Full femtosecond laser:

Including full femtosecond FLEX (large incision, eliminating 20mm incision) and full femtosecond minimally invasive SMILE (small incision, only 2-4mm), full femtosecond minimally invasive SMILE does not need corneal flap, small incision is more conducive to protecting corneal structure, the effect is stable, the operation time is short, and it is also suitable for patients with dry eye, astigmatism and thin cornea. The whole process of full femtosecond laser surgery has realized the real minimally invasive and ensured the "incision-free" state after operation. Completely get rid of excimer laser and corneal lamellar knife. Therefore, the "full femtosecond" surgery is more accurate, safer and more comfortable than the "semi-femtosecond" surgery, and the postoperative recovery is faster.