Semi-femtosecond laser surgery does negative pressure suction to fixate the eyeball, there is a possibility of damage to the retina, but the damage is usually small. Semi-femtosecond laser surgery requires the use of negative pressure ring to fixate the eyeball during the operation, so as to avoid the eyeball turning during the operation and causing the surgical effect to be affected. When the negative pressure ring fixes the eyeball, it forms a certain pulling effect on the eyeball, which may have some damage to the retina, but the damage is generally small. If the patient’s retina itself has weak structures such as dry fissures and lattice-like degeneration zones, there may be an increased risk of retinal detachment under the attraction of the negative pressure ring. Therefore, patients need to undergo a detailed fundus examination before surgery. If there are dry fissures or lattice-like degeneration zones, etc., fundus laser treatment to close the lesion area can reduce the risk of retinal detachment during surgery. It is recommended that patients follow the doctor’s instructions for care after hemi-femtosecond surgery, have regular follow-ups, and seek prompt medical attention when discomfort occurs.