I always figured the alter perception thing just meant their eyes had the capability to change what type of energy they can pick up visually.
It doesn't really sound too helpful in most cases unless you need to follow an energy trail or see something that's not visible to the normal light spectrum.
Hence why all the people who have it rarely use it. Except Geordi, because he has to use the other spectrums to see anything. Geordi rocks though.
Originally posted by Symmetric Chaos
I believe you are falling into the Gods in the gaps fallacy. Meaning that you seem to be searching for the most fantastical explanation for a phenomenon.
Wow, I didn't know there was a term for that.