Currently, there are four mainstream myopia surgery methods, which are mainly divided into two categories: one is laser surgery, including Trans-PRK, excimer laser (LASIK), and full femtosecond laser (SMILE). ) three types.
The other type is intraocular contact lens implantation, which can be understood as installing a special contact lens into the eye, also called ICL implantation surgery. Although laser surgery is divided into three types, the basic principles are the same. The myopia glasses we usually wear are actually concave lenses. The principle of laser surgery is to artificially cut off a convex lens on the cornea, which is equivalent to creating a "concave lens", that is, cutting out the shape of a small spectacle lens on the eye.
Half-femtosecond
Use femtosecond laser to create a corneal flap and then use excimer laser to cut the cornea. The difference between half-femtosecond and excimer lasers lies in the different methods of making corneal flaps. Half-femtosecond uses femtosecond laser, while excimer uses lamellar scalpel.
Full femtosecond laser surgery
Full femtosecond laser surgery does not require the creation of a corneal flap. Instead, it performs two laser blasts at different depths on the stromal layer of the cornea to form a stromal lens. Then take out the lens through a 3~4 mm micro-incision. To put it simply, the all-femtosecond laser does not need to open a window to the cornea. It only needs to make a lens on the cornea and then take it out.
ICL intraocular lens implantation surgery
This is an operation completely different from laser surgery. The doctor restores the patient's vision by implanting an intraocular lens into the eye. It can be understood that the doctor first makes a small spectacles and then puts them into the patient's eyes.