Table 1.

 Standardised filtering bleb classification and bleb score

Vascularisation	0 = avascular	0, 0–1	3 points
	1 = equal to surrounding conjunctiva	1, 1–2	2 points
	2 = enhanced	2	1 point
	3 = massive	3	0 point
Screw vessels	0 = no	0	3 points
	1 = in 1 third	0–1	2 points
	2 = in 2 third parts	1	1 point
	3 = in whole bleb	2, 3	0 point
Microcyts	0 = no	0	0 point
	1 = above scleral flap	0–1, 1	1 point
	2 = at one side	1–2, 2	2 points
	3 = in whole bleb	2–3, 3	3 points
Encapsulation	0 = no	0	3 points
	1 = in 1 third	1	2 points
	2 = in 2 third parts	2	1 point
	3 = in whole bleb	3	0 point