A prospective randomized controlled trial was conducted at Al Watany Eye Hospital in Egypt. Patients with refractory primary or secondary childhood glaucoma who glaucoma specialist has decided to perform a tube implant to control their intraocular pressure are randomized to receive either Paul or Ahmed glaucoma drainage devices.~Patients will be followed up for at least one year during which the following data are collected.~Age, sex, laterality, preoperative and postoperative intraocular pressure and glaucoma medications at 1,3,6, 9, and 12 months visits. Any intraoperative or postoperative complications will be recorded
A randomized controlled trial comparing the efficacy and safety of Paul glaucoma implant and Ahmed glaucoma valve in refractory childhood glaucoma patients