I've heard people say their favorite form of eyewear is progressive lenses -- but I'm baffled as to how these could work for sustained computer usage.  Usually I'm using my laptop, on my lap, and my new progressive lenses seem to never show clear letters except at a certain angle, requiring an uncomfortable tilt of the head.The conventional wisdom is you get used to them after two weeks and then can't imagine wearing anything.  Any HN readers have their own experiences they'd like to share?