Cystoid Macular Edema

This term is used to describe a condition where cyst-like spaces appear in the inner retinal layers (most commonly outer plexiform layer) of the retina. It is formed due to the leakage from the inner blood retinal barrier.
Causes

Post intraocular surgery like cataract surgery, trabeculectomy, keratoplasty
Vascular Occlusion like retinal vein occlusion
Drugs causing macular edema
- Nicotinic acid
- Epinephrine
-Tamoxifen
- PG analogues

Can be remembered with mnemonic NEET- PG

Other causes
- Ocular conditions like diabetic macular edema, hypertensive retinopathy, Eale’s disease, pars planitis, posterior uveitis, retinitis pigmentosa, wet ARMD, vitreomacular traction
-Intraocular tumors