HOW

Different refractive surgery techniques exist. The two most frequently used are PRK and LASIK.

PRK (Photorefractive keratectomy)

PRK is a surface treatment.

After removal of the epithelium (cornea's superficial
layer) with a rotary brush, laser Excimer ablation is
performed on the surface of the cornea.

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PRK

LASIK (Laser Assisted In Situ Keratomileusis)

LASIK is an in depth treatment.

A microkeratome raises
a corneal flap, a deeper laser Excimer ablation is
performed on the stroma, and then the corneal flap is
replaced.

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PRK or LASIK ?

Myopia :

• Small myopia : (under -4.0 dioptres): preferably PRK, or LASIK.
  Excellent visual result in 95% of the cases.
  
• Medium myopia: (from -4.5 to -8.0 dioptres) : PRK or LASIK.
  Excellent result in 85% of the cases.
  
• High myopia (above -8.5 dioptres): PRK or intraocular implants.

Hyperopia :

• Hyperopia under +4.0 dioptres: reliable results. Final visual result is longer to achieve than for myopia.


• Hyperopia above +4.5 dioptres: definite amelioration, but regression is possible leading to retreatment.

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DISADVANTAGES

Additional correction with eyeglasses or contact lenses may be necessary.

Dazzle and haze perception may be uncomfortable when driving at night.

Refractive surgery procedures fall into the rule that there is no surgery without risk. Even if risks are very low, complications may occur. These complications require medical treatment and may need laser retreatment. The ultimate risk, losing the eye, is exceptional to the point that it is difficult to evaluate.

An information sheet published by the Société Française d'Ophtalmologie is available at the doctor's practice.

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