What are the differences between PRK and LASIK?
They both are used to improve nearsightedness and astigmatism by changing the shape of the cornea, the clear front window of the eye, to allow better vision without glasses or contacts. They both use the same laser, but they differ in technique and post operative recovery. In PRK, the outer layer of the cornea is reshaped with the laser, but in LASIK, a thin flap of the cornea is lifted; then the underlying cornea is treated with the laser, and then the flap is laid back in place. During the post operative recovery period, we usually see these differences between PRK and LASIK: A bandage contact lens is worn for 3-4 days after PRK, but there is usually no contact with LASIK. The vision usually recovers more slowly after PRK. LASIK eyes usually recover more quickly. Patients who have PRK usually need to use drops for several weeks. LASIK patients use drops for about 1 week. If retreatment is needed to improve the result, PRK patients need to wait at least 6 months. Lasik patients may be
In both procedures the cool beam of the excimer laser is used to re-shape the cornea. The approach to accessing the area of the cornea to be treated is very different, however. LASIK patients experience rapid visual recovery (with minimum discomfort) because a protective flap is created using tiny pulses of laser light. The flap is replaced after the procedure. With PRK the outer epithelial is lightly removed and a contact bandage is placed over the cornea. Mild discomfort may be experienced and the contact is removed within 5 to 7 days.
