I basically never care about hair or eye color when it comes to actors in Superman stuff (except for Superman's hair color being black or at least dark brown). Like, I'm totally unfazed by Clark having brown eyes in Lois & Clark or Jimmy not having red hair in...well, almost everything.
I would hope most people who prefer Lois' eyes be purple mostly mean for comics and cartoons. I mean, you COULD digitally edit a Lois actor's eye to be purple, but I'm not even sure that would look good, much less be worth it.