I’m not sure if this is a feature or a bug: you can be Near-sighted and Far-sighted at the same time.
I consider it a (known) bug, with one of two resolutions:
or
So… just have to wait for someone to decide to implement one of those.
That particular trait conflict is not a bug, really. You can be both near-and-farsighted at the same time.
There are however bugs in chargen that let you choose mutually exclusive traits like Skilled Liar & Truth-teller or Ugly & Pretty.