GFAP and glaucoma: Further, the ratio of overall fascicular area to GFAP positive area was significantly greater for control subjects (462.4 μm2 ± 73.66) than the same ratio for glaucoma subjects (268.0 μm2 ± 112.1, p = 0.0011, CI 95% -296.1, -92.67) (Fig. 5F).