You will lose stereopsis, an important part of depth perception. It's not the end of the world, people who lose one eye adapt to it. People who have never had it don't even know what they are missing, but can still fly airplanes. But if you've had it and abruptly lose it, it probably will take you six months to learn how to use the monocular clues that get your depth perception back to approximately normal. That's a sort of long grounding because you don't want to be embarrassed to wear bifocals. You do know that with progressive lenses, no one will even notice the line don't you?