Eye'm blind

Recently, I've noticed that I can't really see as well as I used to be able to. I think as a kid I probably had a little better than 20/20 vision in both eyes. Maybe 20/18 in one. Anyways, I was getting worried about it this past week since it seems to have come on rather quickly. So today I printed out a Snellen Eye Chart and tried it out. Shit. One eye is like 20/40 and the other is 20/30. Now, obviously this is just an in house diagnostic but still, I feel like it's at least a bad sign. As such, I'm off to the local doc next week to try and figure this out. I hope I don't go blind.