Macular edema is caused by all except –: (A) Micro aneurysm, (B) Capillary dilatation, (C) Neovascularization, (D) None
Answer is D. Causes of macular edema :-

Metabolic alteration :- Diabetes, retinitis pigmentosa, inherited cystoid macular edema (CME).
Ischemia CRVO, Diabetic retinopathy, severe hypertensive retinopathy, HELLP syndrome, vasculitis.
Mechanical force :- Vitreous traction on the macula.
Inflammation :- Intermediate uveitis, post-operative CME, choroidal inflammatory diseases.
Pharmacotoxicity :- Epinephrine (in Aphakia), Betaxolol, latanoprost..