Comparison of refractive outcomes after combined cataract and glaucoma surgery: trabeculectomy and glaucoma drainage device implantation.

Purpose: To investigate the refractive outcome of combined cataract surgery and glaucoma drainage device (GDD) implantation compared with trabeculectomy and cataract surgery.

Setting: Department of Ophthalmology, National University Health System, Singapore.

Design: Retrospective cohort study.