Grading of bleb height: a H0, elevated flat bleb, b H1, bleb height ≤ 1 mm, and c H2, bleb height >1 mm. Grading of bleb extent: d E0, ≤ 3 clock hours, and e E1, > 3 clock hours. Grading of bleb vascularity: f V0, normal vascularity, g V1, hypovascularity, and h V2, avascularity