Risk factor for failure | Number |
Previous failed trabeculectomy | 7 |
Previous failed trabeculectomy and Afro-Caribbean race | 2 |
Previous failed trabeculectomy and cataract extraction | 4 |
Previous cataract extraction | 2 |
Previous cataract extraction and Afro-Caribbean race | 1 |
Uveitis | 3 |
Uveitis and age less than 50 | 1 |
Age less than 50 | 1 |