PRK / LASEK
PRK (Photorefractive Keratectomy), like Lasik, is a treatment method to correct refractive errors. Unlike Lasik, which is still the most commonly used technique, a thin layer (flap) is not created by incision in the cornea in the PRK method; instead, the laser is started directly from the external surface. A PRK surgery involves removing the outer thin live tissue called epithelium from the cornea and administering Excimer Laser on the tissue underneath. A clear, protective "bandage" contact lens is placed in the eye at the end of the operation to be worn for several days so that the cornea surface can heal more easily. Recovery of good vision takes longer than Lasik and may take 3-4 weeks. Pain and discomfort is felt for 2-4 days after the operation because healing of the epithelial tissue is completed in this period.
Lasek involves lifting the eye's epithelial tissue using alcohol. The epithelium is replaced after the administration of laser. Highly reliable results are obtained by this two-surface method; however, some patients may experience burning, stinging and watering in the eyes for 2-3 days. Vision gets clear within 1 week to 10 days on average. With this treatment method, the final result may be achieved in the third month; however, patients can carry out their daily activities without the need for eyeglasses during this period of time.
Features of PRK and LASEK methods
- They are recommended for patients whose corneal thickness is not suitable for Lasik surgery although they have low diopter values (myopia and astigmatism up to -3D).
- As in the Lasik method, the eye is numbed by eye drops only.
- The patient feels no pain during the operation.
- A contact lens is placed to accelerate renewal of the epithelium and protect the eye, and it is removed by the doctor 3-4 days after the operation.