Laser Vision Correction

Laser vision correction.

Laser correction view is considered an advanced area of modern ophthalmology. Excimer laser beam accurately and carefully affects the cornea of the eye. Modern computer systems for excimer laser Optometrists can fix almost all kinds and degrees of visual impairment.

For laser vision correction has a medical (different visual acuity of the right and left eye) and professional (occupation requiring instant response, or work in a polluted and smoggy) readings. In the absence of contraindications, the operation can be carried out, and at the request of the patient.

Operations on laser vision correction have limitations. They are contraindicated:

  • persons under 18 years of age (this is related to the time the final formation of the eyeball);
  • during pregnancy or breast-feeding (during the hormonal changes the body);
  • under certain severe systemic disease organism (diabetes and other endocrine disorders, immunodeficiencies, autoimmune diseases, etc.);
  • infectious diseases;
  • in acute inflammatory diseases eye, cataracts, glaucoma, progressive myopia, various diseases of the retina.

Photorefractive keratectomy (PRK)

The first development of refractive laser surgery, which applies at present, was the operation "photorefractive keratectomy" (PRK). PRK is a non-contact exposure excimer laser on the surface layers of the cornea, without affecting the other structures of the eye. In this laser working in the scanning mode, "smoothing" and "simulates" the surface. The laser controlled by a computer program. In practice, this is not even an operation in the conventional sense, as the ophthalmic surgeon does not directly interact with the tissues of the eye.

PRK allows single-step fix:

  • Myopia from -1.0 to -6.0 diopters
  • Astigmatism from -0.5 to -3.0 diopters
  • Hyperopia up to +3.0 diopters.

At high degrees of visual impairment PRK is carried out in several stages. This operation can be done on both eyes at the same time.

After PRK corneal remains "mikroeroziya" which heals within 24-72 hours. At this time the person concerned sensation of a foreign body in the eye, pain, pain, excessive tearing, photophobia — so for three days is recommended to be in a darkened room. During one to three months after operations must be instilled drops.

Advantages of PRK surgery:

  • Completely non-contact exposure;
  • Painless procedure;
  • Short-time operation;
  • The predictability of the effect;
  • Stability results.

Complications occur after PRK4-12 % Of cases. In general, they are associated with disturbances in the healing process (inflammation, lung opacities, insufficient correction, etc.) and errors surgeon (the desire to eliminate one step higher degree of deviation, lack of skills).

LASIK (laser keratomileusis, LASIK Lasik)

Operation LASIK (laser keratomileusis) was developed after PRK and is safer and more efficient. Performed by a qualified surgeon, the operation corrects up to 15 diopters of myopia and reduces the rehabilitation period to a few days. At very high myopia — more than 15 diopters — LASIK is not recommended because of that the correction cornea dangerously thinner. In such cases, can only help the implantation of an intraocular lens.

The operation is performed on the basis of accurate numerical calculations for each patient. LASIK is a combination of microsurgery andexcimer laser technology. This method allows you to keep the anatomy of the layers of the cornea.

On one upper stage (protective) layer of the cornea is removed to form a flap with an automatic microsurgical instrument — microkeratome. This will open access to the middle strata of the corneal tissue. This procedure is 2-5 seconds and is painless. Then, using an excimer laser uniform inner layers of the cornea evaporate to a depth which is necessary to impart the desired curvature. Then a protective layer on the back seat.

A few hours after the operation, you can return to normal life. The whole procedure lasts only 1-15 minutes.

Benefits of surgery LASIK:

  • Saving anatomy layers of the cornea (the precision and careful surgery on the eye);
  • The rapid recovery of vision, the majority of patients the restoration of vision occurs in the first 2 — 24 hours;
  • Painless procedure;
  • The predictability of the effect;
  • Stability of the results;
  • There are no seams, scars and cuts;
  • Perhaps a right of correction of both eye.

Discomfort after surgery may be only during the first few hours. In vostanovitelny period — about ten days — will need to be instilled into the eyes special drops. Some patients experienced postoperative visual discomfort at night for several months after surgery.

In general, LASIK — it is more effective operation with fewer complications than PRK, but it also requires high expenses.

To postoperative period passed quickly and without complications, you should follow a few guidelines:

  • try not to sleep on the side of the operated eye first 3-7 days after surgery;
  • do not rub your eyes with his hands and did not click on it;
  • Avoid contact with eyes water or soap;
  • not the swimming pools and baths for three months;
  • on the street to use sunglasses.

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