If you don’t already deal with a condition called presbyopia, you probably will by your mid-40s. It’s when the lenses in your eyes lose elasticity making it hard to focus on objects up close, like the words in a book. The solution is to occasionally wear reading glasses or glasses with progressive lenses that can limit your focal range. But researchers at Stanford University have come up with another solution; glasses that detect and automatically focus on whatever someone’s eyes are looking at.