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Table 5 Correlation between gass, international vitreomacular traction study, and the updated classification systems for large macular holes

From: Surgical classification for large macular hole: based on different surgical techniques results: the CLOSE study group

FTHM stages based on gass classification [1] 1995

International vitreomacular traction study classification system [3]

CLOSE study group updated classification for FTMH based on minimum linear diameter (µm)

Stage 0

VMA

VMA

Stage 1: impending macular hole

VMT

VMT

Stage 2: small hole

Small (≤ 250 μm) or medium (> 250 to  ≤ 400 μm) FTMH with VMT

Small

 ≤ 250 µm

Stage 3: large hole

Medium or large (> 400 μm) FTMH with VMT

Medium

 > 250 to ≤ 400 µm

Stage 4: FTMH with PVD

Small, medium, or large FTMH without VMT

Large

 > 400 to ≤ 550 µm

X-large

 > 550 to ≤ 800 µm

XX-large

 > 800 to ≤ 1000 µm

Giant

 > 1000 µm

  1. VMA vitreomacular adhesion, VMT vitreomacular traction, FTMH full-thickness macular hole, PVD posterior vitreous detachment