Radial keratotomy.

Radial keratotomy is effective for correcting low-grade myopia. The predictability is best for myopia that is less than 4 diopters. If the procedure is well performed, the rate of complications remains low. There is not always good correlation between refraction and keratometric changes because of correction errors, which are the main complication. Glare and fluctuating vision are common in the weeks following surgery. Wound healing may be delayed. Histological studies have shown that the epithelial plug is sometimes not eliminated after 4 years, which explains the long-term changes in refraction and corneal fragility after trauma. Incision ruptures can occur many years after surgery. The long-term evolution after 10 years is not known, and the indications are still controversial because it is a surgical procedure that modifies the visual function of a healthy eye.