Severe Proliferative Diabetic Retinopathy

The surgical technique (Group 1) included vitrectomy, with a combination of delamination and segmentation of gliotic tractional membranes using bimanual technique. Silicone oil tamponade was used in eyes with long-standing tractional retinal detachment, as deemed necessary by the surgeon, or in eyes in which a retinal break occurred during the vitrectomy.

Panretinal photocoagulation was completed according to guidelines summarized in ETDRS with extensive full subconfluent panretinal photocoagulation.