<prompt> Leaving the capsule behind in cataract surgery is advantageous because it -Prevents cystoid macular edemaDecreases endothelial damageProgressively improves visionDecreased chance of retinal detachement  <response>: As postoperative complication following cataract extraction cystoid macular edemaCME occurs. Cystoid macular edemaCME refers to collection of fluid in the outer plexiform Henles layer and inner nuclear layer of the retina, centred around the foveola. So leaving the capsule behind in cataract surgery is advantageous prevents cystoid macular edema. 