Suction of the eyeball during hemi-femtosecond surgery does not cause retinal detachment. Semi-femtosecond surgery is mainly used for the treatment of myopia, and usually requires the use of both femtosecond and excimer laser equipment to perform the surgical operation in steps. During the semi-femtosecond surgery, a professional surgeon will use a negative pressure ring to suction the eyeball to prevent it from rotating and affecting the surgery. However, today’s semi-femtosecond surgeries are more sophisticated and the surgeons are generally very professional and will not cause retinal detachment. It should be noted that if you suffer from high myopia, retinal detachment can easily occur. Therefore, patients with high myopia belong to the group of people with high incidence of retinal detachment, and when they have semi-femtosecond surgery, retinal detachment may occur, but it is not necessarily caused by the surgery. Therefore, before having a hemifemtosecond surgery, it is important to cooperate with a professional ophthalmologist to conduct a retinal examination and make a good preoperative evaluation to avoid the risk of retinal detachment after the surgery as much as possible.