LASIK: Correction of myopia, hyperopia and astigmatism.

The Benefits of LASIK Surgery

The common eye problems known as refractive services, can be corrected with a type of surgery called LASIK.

The 75% of the population suffers from a refraction defect. These prevent light "do focus" (converge at one point) in perfect form in the retina and create a sharp image. These are the four types of refractive surgery services: myopia, hyperopia, astigmatism y presbyopia, depending on where you are by focusing the light on the retina.

These eye problems, depend on its severity, have fought through the use of glasses, contact lenses and, in recent times, surgery. The rate of surgical interventions (no more than 30 minutes), an application of anesthetic drops and a quick recovery of sight, make this form of correction that has revolutionized the industry and became an alternative even closer to the public.


Surgery area:

Photorefractive keratectomy. Low myopia used (up to 6 diopters), because this phenomenon can be reproduced when myopia is more severe. Consists of removing the epithelium (kind of skin) of the cornea and applied laser directly. After 3 to 4 days, the epithelium regrows, and the patient fully recovers their vision.

The range of myopia for this technique is higher (up to 12 diopters). In this surgery the epithelium is not removed, it stands a "side" of the cornea, the laser is applied and then put back in place. This does not touch the surface of the eye, vision recovers faster and is painless.

Stromal Corneal Ring. Corrects up to 6 diopters myopia. The thickness of the cornea a ring is implanted. This surgery is reversible. The person can try if the vision gets better once the ring is installed. Otherwise, it returns to how it was before.

Surgery inside the eye:
Although more than 80% of the myopic is in category 1 to 6 diopters, there are patients whose myopia exceeds 12. In these cases, the problem is corrected by intraocular lenses. Installing a lens inside the eye, sometimes taking lens, when it is opaque.



  • Be at least 21 years, or when the defect is stabilized.
  • Having eyes, retina or corneal scarring in good condition, and no other disease or eye problems.
  • Owning a mild to moderate myopia, within the range that covers the intervention (your doctor will determine your range).
  • No vascular diseases or immunodeficiency.
  • Pregnant women should not undergo this type of surgery, since pregnancy sometimes modifies the refraction of the eye.
  • Being well informed about the risks and benefits of laser surgery compared with other procedures.

If you have additional questions consult our website LASIK Surgery FAQs.