Full femtosecond and semi-femtosecond are different in terms of surgical principle, surgical characteristics and applicable people, so you need to choose the best way according to the actual situation under the doctor’s advice.
Full femtosecond surgery is done completely with femtosecond laser, which requires making a small incision on the cornea, then using femtosecond laser to cut out the lens on the cornea, and then removing the lens to achieve the purpose of correcting myopia. Semi-femtosecond surgery involves making a corneal flap in the cornea with a femtosecond laser, then lifting the flap and removing the degree of myopia with the laser to achieve vision correction.
Full femtosecond surgery eliminates the need to make a corneal flap, thus avoiding postoperative corneal flap dislocation due to external forces. The probability of dry eye after full femtosecond surgery is less because there is less damage to the corneal nerves. Semi-femtosecond can correct the corneal flap precisely according to the patient’s degree and the axis of astigmatism, which is comparatively more likely to be infected.
Full femtosecond surgery is mainly applicable to patients with myopia below 800 diopters, while semi-femtosecond surgery is generally used for myopia patients with myopia below 1,000 diopters. Comparatively speaking, semi-femtosecond surgery has a wider range of corrections, and at the same time, semi-femtosecond surgery can correct higher-order aberrations affecting night vision, which is generally not possible with full femtosecond surgery.
Full femtosecond surgery and half-femtosecond surgery are different from each other, you need to visit your doctor to improve the examination, and then choose the specific surgery under the guidance of your doctor.