Vision loss may occur one month after semi-femtosecond laser surgery, which is mainly due to eye fatigue and dry eye syndrome. 1. Eye fatigue: after semi-femtosecond laser surgery, the eye regulation function has not been fully restored, so it is easier to cause eye fatigue and pseudomyopia. If you keep bad eye habits for a long time, it is very likely to lead to permanent loss of vision. So don’t use computer, cell phone and other electronic products for a long time after surgery. 2. Dry eye: Half femtosecond laser surgery will destroy the peripheral nerve fibers, leading to abnormal tear secretion, resulting in dry eye, and show the phenomenon of vision loss. Secondly, it may also be accompanied by dry eyes, photophobia, eye soreness and other adverse symptoms. In order to avoid long-term vision impairment, it is recommended to seek medical attention after the appearance of vision loss and not to delay the condition.