Table 5.

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

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

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