Good lighting is a must, I use 3 of the photographic trumpet type bulbs mounted in Ikea multi-poise lamps and they do not give off a lot of heat.
Vision correct, depends on your focal length. Some people are able to have stronger prescription glasses made up to suit a specific focal length, others have to use an optivisor.
My eyes started tiring at aged 41, I now use reading glasses and an Optivisor for painting :-(