The control group was composed of patients who had undergone a trabeculectomy by 1 of the 5 surgeons at our center but who did not have a bleb leak requiring surgical revision in the operating room.

Palmberg P, Zacchei AC . Compression sutures: a new treatment for leaking or painful filtration blebs. Invest Ophthalmol Vis Sci 1996;37:s444.

If the drops start to fail then patients can move on to a trabeculectomy, which involves surgery to make a small hole in the eye wall, or have a stent inserted. In a small number of patients ...