Could My Double Vision And Blurry Text Under White Light Be Due To Refractive Error Or Presbyopia?

Hello eye specialist. I have double vision (refractive error) for 9 months now. It used to appear with objects at far distances. I have been using correctol 0,1%. Now i feel it at a very close reading distance, especially when trying to read fine print without reading glasses. The doctor told me of late that it is presbyopia because i am 50 years now. Two days ago, i made a stunning discovery. When i read under a blue led light bulb without glasses, it is very okay. But when i switch to white light without glasses, it becomes a problem. The texts become blurry. Is it still refractive error manifesting or presbyopia? Thanks