Clinical characteristics of patients with retinal detachment (RD).

<p>Proliferative vitreoretinopathy (PVR) is graded using the up-dated classification of the Retina Society Terminology Committee by Machemer <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0028791#pone.0028791-Machemer1" target="_blank">[22]</a>. There are three grades describing increasing severity of the disease: A, B and C. In patients that all required retinectomy, RDs are always associated with grade C of PVR. Posterior (P) and anterior (A) location of the proliferations are specified. The extent of the abnormalities is detailed by using clock hours. Hence, CP3–CA2 means grade C of PVR with both posterior (P) and anterior (A) abnormalities extended over three (CP3, meaning ¼) and two (CA2) clock hours respectively.</p>