Classification | Gass and Blodi [2] | Yannuzzi et al. [3] | |||||
---|---|---|---|---|---|---|---|
Clinical stages | Loss of retinal transparency and presence of perifoveal greying (Stage 1) (N = 31) | No or occult visible telangiectasias (Stage 2) (N = 35) | Dilated right angled venules (Stage 3) (N = 73) | Retinal pigment plaques (Stage 4) (N = 38) | Presence of SRNVM or proliferative disease (Stage 5) (N = 35) | Non-proliferative stage (N = 175) | Proliferative stage (N = 37) |
SDOCT features | |||||||
Irregularity of foveal contour (N, %) | 2 (6) | 4 (11) | 12 (16) | 22 (58) | 26 (74) | 39 (22) | 27 (73) |
ILM drape (N, %) | 12 (39) | 17 (49) | 27 (37) | 2 (5) | 4 (11) | 57 (33) | 5 (14) |
Hyperreflective middle retinal layers (N, %) | 30 (97) | 34 (97) | 69 (95) | 35 (92) | 16 (46) | 166 (95) | 18 (49) |
Superficial hyperreflective retinal dots (N, %) | 0 (0) | 0 (0) | 1 (1) | 3 (8) | 2 (6) | 4 (2) | 2 (5) |
Hypo reflective inner retinal cavities (N, %) | 16 (52) | 26 (74) | 39 (53) | 13 (34) | 10 (29) | 93 (53) | 11 (30) |
Outward bending of inner retinal layers (N, %) | 7 (23) | 0 (0) | 29 (40) | 20 (53) | 8 (23) | 66 (38) | 8 (22) |
Hypo reflective outer retinal cavities (N, %) | 7 (23) | 9 (26) | 13 (18) | 3 (8) | 0 (0) | 32 (18) | 0 (0) |
Hyperreflective retinal pigment clumps (N, %) | 1 (3) | 3 (9) | 11 (15) | 37 (97) | 22 (63) | 52 (30) | 22 (59) |
Subfoveal SRF (N, %) | 2 (6) | 3 (9) | 18 (25) | 2 (5) | 9 (26) | 24 (14) | 10 (27) |
SRNVM (N, %) | 1 (3) | 2 (6) | 10 (14) | 3 (8) | 25 (71) | 15 (9) | 25 (70) |
RCA (N, %) | 1 (3) | 1 (3) | 2 (3) | 5 (13) | 10 (29) | 10 (6) | 10 (27) |