I have normal (mostly) vision in my good eye. When I do wear a contact it is considered AMA (against medical advice) so I wouldn't advise people to do that. The eye doctors tell me that the glasses act as another level of protection for my good eye. But other than that, I have no other danger of losing sight in that eye. I was born blind in one eye, it's part of a congenital birth defect, but no one can really tell by looking at me (until I run into things on that side, lol)

So, when I do wear a contact, I only wear them on occasion, usually special occasions when I don't want to wear glasses, and usually then only for a couple of hours or so.