Table 2.

Criteria used for defining surgical success in evaluating glaucoma surgery

Surgery	Success criteria
Trabeculectomy	• IOP 6-21 mmHg and at least 30% IOP reduction [2]
	• IOP 5-21 mmHg and IOP decrease of ≥ 20% [3,4]
	• IOP ≥ 6 - ≤ 18 mmHg [5]
	• IOP > 5 - ≤ 18 mmHg or 20% reduction [6,7]
	• IOP 6-16 mmHg without medication (complete success), ≥ 6 - ≤ 16 mmHg with one antiglaucoma medicine or needling (Qualified success) [8]
	• IOP ≤ 15 mmHg [9]
Glaucoma Drainage Devices	• IOP ≤ 21 or > 20% IOP reduction, success rates at IOP levels ≤ 17, ≤ 14 mmHg also evaluated [10,11]
	• IOP ≤ 21, ≤ 16 mmHg [12], qualified success - up to 2 topicals
	• 5-21 or ≥ 25% IOP reduction [13]
	• IOP ≥ 5 - ≤ 18 mmHg [14]
Deep Sclerectomy	• IOP reduction > 25% [15]
	• IOP of < 18 mmHg and at least 20% IOP reduction [16]
MIGS	• IOP reduction ≥ 20% on the same or fewer medications in a study on Xen implant without cataract surgery [17]
	• IOP reduction and medicine reduction in a study on Trabeular bypass stents in combination with cataract surgery [18]