A 35 year old insulin dependent diabetes mellitus (IDDM) patient on Insulin for the past 10 years complains of gradually progressive painless loss of vision. Most likely he has:

D i.e. Tractional Retinal detachment not involving the macula DR leads to tractional retinal detachment, which presents with slowly progressive loss of vision. There is no photopsia or floaters unless macula is involvedQ because the vitreo-retinal traction develops very slowly.