Retinal venous occlusive disease.

Occlusions of the retinal venous system are the second most common retinal vascular disease after diabetic retinopathy. Patients present with sudden vision loss or may be asymptomatic. Retinal vein occlusions are classified into branch or central occlusions. Laser photocoagulation and vitreoretinal surgical techniques are used to treat the complications of macular edema, neovascularization, vitreous hemorrhage and retinal detachment