I'm long-sighted and need reading glasses. As I've got older I need a bit of help with distance too now. I wear distance glasses for cycling and driving, and I find there's enough assistance there for me to be able to read the computer on the bike. I've got varifocals, but I can't wear them for golf (the ball 'moves' as I move my head), and I don't wear them cycling. I suspect that varifocals could give similar problems when cycling as you look up at the road and down at the handlebars. I carry my reading glasses when I'm out on the bike in case I need to fix a problem or read a menu. Single-vision lenses are a lot cheaper and better for a specific task in my opinion.