Purple isn't likely to be much of a problem, but at night in my city, the buses have blue lights. I can't tell the difference between those lights and the green stoplights with my left eye isolated. I can't see yellow at all with my left eye, but from my right eye it's like a lemon candy version of the No Frills grocery store. Pretty significant difference. Some yellows look pink or beige with the left eye alone. The only colours both eyes generally agree on are cyan and a particular shade of vivid pink, and red. All other colours don't agree (although of course I'm used to it, so I only notice it when using one eye at a time.)
I imagine it would be foolhardy to do this to yourself on purpose with glasses you'll be pretty much living your visual life through.