How a cool laser reshapes your cornea to fix your vision in minutes
In short: LASIK, or Laser-Assisted In-Situ Keratomileusis, uses a precise ultraviolet beam to vaporize microscopic portions of your cornea. By altering the eye's shape, surgeons change its focal point, effectively correcting nearsightedness and other refractive errors. This rapid, common procedure offers a permanent alternative to relying on glasses or contact lenses.
The LASIK process begins with a rigorous preoperative exam to ensure the patient meets specific criteria for corneal thickness, pupil size, and vision range. Once cleared, the surgeon uses a microkeratome—a specialized surgical blade—to create a flap in the cornea. This flap is folded back, exposing the underlying tissue for the laser. The patient is asked to focus on a red light to help center the eye while the surgeon calibrates the equipment.
The core of the procedure involves an Excimer laser, which emits a tightly focused beam of ultraviolet light. Unlike traditional lasers, this is a 'cool' laser; it does not heat the surrounding tissue but instead breaks down molecular bonds to vaporize microscopic amounts of the cornea. By controlling the number, size, and position of these pulses, the surgeon reshapes the cornea to correct how light refracts onto the retina. The entire process for both eyes typically takes between 15 and 30 minutes, after which the corneal flap is replaced to heal naturally.
While LASIK is highly effective, it is not without risks. Common side effects include temporary dry eyes, glare, halos around lights, and light sensitivity. More serious, though rare, complications can include corneal ectasia, infection, or vision loss. Furthermore, some patients may experience undercorrection or overcorrection, which might necessitate a second, refining procedure. Because of the potential for complications and the prevalence of aggressive marketing, the FDA has issued warnings regarding providers who downplay these risks. Despite this, the procedure remains a widely utilized solution for those seeking to reduce their dependence on corrective eyewear.
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Sources
- Summary by Intellect · source: How Does LASIK Work?
- Also: LASIK eye surgery - Mayo Clinic
- Also: www.nhs.uk — Laser eye surgery and lens surgery
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