<prompt> A 35 year old insulin dependent diabetes mellitus IDDM patient on Insulin for the last 10 year complains of gradually progressive painless loss of vision. Most likely he hasCataractVitreous haemorrhageTotal rhegmatogenous retinal detachmentTractional retinal detachment not involving the macula  <response>: Among the given options, option a d can cause progressive painless loss of vision.Painless loss of vision in diabetiesGradual :- Cataract, macular edema NPDR, Tractional retinal detachment not involving the central retina macula in PDR.Sudden :- Vitreous hemorrhage PDR, Tractional retinal detachment PDR. Now the question arises which is more common cause cataract or retinal detachment not involving the macula.Undoubtly answer is cataract because usually retinal detachment involves central retina macula which causes sudden loss of vision. Retinal detachment without macular involvement is less common. 