Table 1.

Classification from the Retina Society Terminology Committee (1983) [4]. This classification subdivided PVR into four stages, A, B, C, and D, apparently increasing in severity, from minimal to massive PVR. Modified from The Retina Society Terminology Committee, [4].

Retina Society Terminology Committee (1983)
Grade	Clinical signs
A (minimal)	Vitreous haze and pigment clumps
B (moderate)	Surface retinal wrinkling, rolled edges of the retinal, retinal stiffness, and vessel tortuosity
C (marked)	Full-thickness fixed retinal folds in
(i) C-1	(i) one quadrant,
(ii) C-2	(ii) two quadrants,
(iii) C-3	(iii) three quadrants
D (massive)	Fixed retinal folds in four quadrants that result in
(i) D-1	(i) a wide funnel shape,
(ii) D-2	(ii) a narrow funnel shape,
(iii) D-3	(iii) closed funnel without view of the optic disc