Effect of phacoemulsification on trabeculectomy function

INTERVENTION: Participants who previously undergone trabeculectomy without antimetabolites are consecutively allocated (1:1) to one of two groups. Group 1 (Temporal group): Participants in this group undergo phacoemulsification with a temporal corneal incision. Group 2 (Superior group): Participants in this group undergo phacoemulsification with a superior corneal incision. Comparisons between the two groups are performed after one year of follow‐up regarding intraocular pressure changes, bleb morphology score using the Wuerzburg bleb classification score and any added glaucoma medications. CONDITION: Cataract and glaucoma ; Eye Diseases ; Cataract and glaucoma PRIMARY OUTCOME: 1. Intraocular pressure changes is measured using the Goldman tonometer … at day one, one week, one month, three months, six months, and one year postoperatively; 2. Bleb morphology score is measured using the Wuerzburg bleb classification score at day one, one week, one month, three months, six months, and one year postoperatively; 3. Additional glaucoma medications are measured using patient's records up to one year postoperatively; SECONDARY OUTCOME: There are no secondary outcome measures. INCLUSION CRITERIA: 1. Previous successful trabeculectomy not augmented by antimetabolites and had well‐controlled IOP 2. Well‐functioning bleb, no preoperative glaucoma medications 3. A visually significant cataract before phacoemulsification 4. Aged 18 and older