Figure 2: Corneal endothelial cell densities at different time intervals following Ahmed glaucoma valve (AGV) implantation. The solid line and dashed lines represent the endothelial cell densities in 72 patients with an AGV implant and 31 controls (fellow glaucomatous eyes without AGV implantation that received glaucoma medications), respectively. The annual rate of the endothelial cell density changes [the regression coefficient (B)], for the patient group decreased gradually: −10.7% from preoperatively to 1 year (p<0.001, Mann–Whitney U-test), −7.0% from year 1 to year 2 (p=0.037), −4.2% from year 2 to year 3 (p=0.230), and −2.7% from year 3 to the follow-up (p=0.111; mean follow-up, 45.3 ± 20.6 months). Standard error bars are shown at 1, 2, and 3 years.