The aim of this study is to compare formulated Posterior Subtenon Triamcinolone acetonide (PSTA) injection versus Posterior Subtenon Triamcinolone acetonide alone in the management of macular edema secondary to non-ischemic retinal vein occlusions, either central or branch.

Inclusion Criteria:

• Diminution vision due to macular edema secondary to non-ischemic retinal vein occlusions, either central or branch, as evidenced by clinical and angiographic evaluation
• CMT ≥ 250 µ.
• Willing to participate in the study

Exclusion Criteria:

• Unwilling to participate in the study.
• Ischemic RVO
• Prior laser treatment
• Glaucoma/Ocular Hypertension
• Cataract which lead to difficulty in the evaluation of macula
• Vitreous hemorrhage
• Macular ischemia
• Iris neovascularisation
• patients with intravitreal injection of anti VEGFs, steroid, or any intraocular surgery 3 months prior to the inclusion.