Abstract: the fundamental reason for myopia is that the anterior and posterior axis of the eye becomes longer, but the diopter of the eye’s’ lens’ – cornea and lens does not change, so the imaging position of the eye is not on the retina, resulting in blurred viewing. Refractive surgery is to change its diopter. During the
summer vacation, ophthalmology and ophthalmology specialty hospitals in major hospitals ushered in the peak of myopia refractive surgery. Some high school students are ready to completely lose their glasses before entering the University, and some college students who are about to enter the senior year want to bid farewell to myopia in the last summer vacation in order to find a job. However, through the interview, it is found that many students and parents have misunderstandings about myopia surgery. The root cause of
myopia is that the anterior and posterior axis of the eye becomes longer, but the diopter of the eye’s “lens” – cornea and lens does not change, so the imaging position of the eye is not on the retina, resulting in blurred viewing. Refractive surgery is to change its diopter. There are many kinds of existing refractive surgery. At present, the most mainstream refractive surgery includes excimer laser surgery, half femtosecond laser surgery, all femtosecond laser surgery and ICL. Patients over the age of 18 can often choose the appropriate surgical method according to their own situation. So, what are the similarities and differences between the four surgical methods?
generally refers to taking the cornea as a transparent material and cutting a pair of lenses on the cornea. Excimer surgery requires the patient’s corneal thickness to be more than 500 microns, and there are certain requirements for the degree of myopia. The degree is stable for more than two years, and there are no other eye diseases such as conjunctivitis and glaucoma.
half femtosecond laser surgery
is similar to excimer laser surgery. The difference is that excimer surgery is to cut the cornea, while half femtosecond surgery uses femtosecond laser to cut the corneal surface for nearly a week to form a corneal flap, and then lift the corneal flap to cut a pair of lenses on the corneal stroma. Half femtosecond surgery avoids cutting cornea with mechanical metal lamellar knife, which is more applicable than excimer surgery. The difference between
all femtosecond laser surgery
and half femtosecond laser surgery is that the whole femtosecond laser surgery does not need to make and open the corneal flap, but cuts a small part of the corneal surface, and then accurately positions the laser in the corneal stroma. After making the inner lens of the corneal stroma, it is taken out through a small incision, which is only 2-3mm, It reduces the damage to the cornea. Full femtosecond surgery is suitable for patients with myopia below 800 degrees, astigmatism within 200 degrees, degree stability for more than two years, and corneal thickness greater than 460 microns. However, full femtosecond surgery cannot be used to treat hyperopia.
ICL lens implantation
ICL is a foreign abbreviation for implantable contact lenses. Different from the “local materials” of the previous operations, ICL does not need to cut the cornea, but implant the customized “lens” – Intraocular Lens – into the eye through minimally invasive surgery, with minimal wound and no damage to the cornea, Therefore, it is safer and the corrected vision is clearer. In addition, if patients need other ophthalmic surgery in the future, the implanted lens can be removed at any time through minor surgery. In several refractive surgery, the applicability of ICL is relatively strong. Patients with myopia of more than 800 degrees and insufficient corneal thickness cannot undergo excimer laser surgery, but their vision can be restored through ICL surgery.
ophthalmologists emphasize that the technology suitable for patients is a good technology. Because the eyes and physical conditions of each patient vary greatly, careful preliminary examination must be carried out before surgery. Patients who can undergo surgery after preliminary examination still need to undergo accurate optometry, recheck corneal topographic map, corneal thickness comparison and other examinations to formulate their own operation plan.