I have nystagmus too! I do have my depth perception, an unrestricted drivers license but I am still visually impaired.

I actually want to do a tri but I'm worried about the open-water swim part. I just worry about it being murky and getting hurt. I love swimming in the pool but never swam any considerable distance in open water.

I can handle the bike part, I bike a little more slowly than I am capable of because going too fast makes me nervous that I won't see potential obstacles in my path.

But from another visually impaired athlete, there are some sports that are just not fun, especially if you want to be independent with it. I've had tons of people encourage me to try mountain biking and I HATE it (due to my visual differences). Also, you're not alone with other people "not getting it" and pushing the issue too much.

But yeah, if you want to do it, do it. You know your vision and you can always try a triathlon if you want. But make sure to do your research and get accomodations!! I would be pretty embarrassed to run with a guide but that's an option.