This was one of the first complaints from the controllers, the small font size on the screen. Apparently it is Arial Narrow 8pt or something similar. Steely eyed aces with eyes like razors have no problem, but after a while even the best sighted people can have problems. It is literally a 'health and safety' issue since it deals with conditions in the workplace in the same way as office lighting and comfortable seating.
Is it a Flight Safety issue? Well it clearly doesn't help.