1. Scars of Radial Keratotomy.
It is an incisional refractive surgery done for myopia.
Deep, radial corneal stromal incisions are made of 90-95% depth in the paracentral and peripheral cornea.
Effect: Weakens the paracentral and peripheral cornea and causes it to bulge outwards and secondarily flattens the central cornea.
Indications:
-Moderate myopia (-1 to -4D).
Contraindications:
-Night drivers (causes glare).
-Sports players.
This procedure is abandoned now because of it's various complications.
-Diurnal fluctuations.
-Increased astigmatism and distortion.
-Instability of refractive error.
-Perforation of cornea.
-Predisposed to infectious keratitis.
-Starburst pattern and glare
Have you seen patients with RK scars in your OPD?
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Image from Rajan Eye Care Hospital