<p class="article-article-intro">Radial keratotomy or RK (some patients call it the pizza pie operation) is an out-dated type of corneal surgery that began in Russia and was used to treat short-sight (myopia).</p> <p>The surgery involved making several radial incisions in the cornea (the number of incision was variable and ranged between four to sixteen depending on the degree of attempted correction). These incisions caused a central flattening or relaxation of the cornea, with resulting reduction or even full correction of short sight. In fact, the procedure was very effective, and many patients underwent this procedure in the 1980’s and early 1990’s before it was abandoned, and had very good correction of their vision.</p>