Native Glukkons? Unlikely, in my opinion, but you never know. It would be interesting to find out at which point they stopped progressing with the rest of their race. If it was before the Age of Alchemy, then they would be Glukkons in their original appearance, which would be very interesting to see.
As for why the Glukkons eyes glow, it's because over thousands of years they have developed an eyesight which is accustomed only to the darkness (although some Glukkons appear to be able to withstand direct sunlight, such as Director Phleg). Exactly why this should actually cause their eyes to give off light I'm not certain. It's definitely more than just light reflecting off their retinas. My guess is that Glukkons (and Rats) have developed the vision-equivalent of radar - their eyes actually give off light, which is then reflected off their environment, allowing them to see. Okay, it doesn't seem likely that that amount of light could illuminate their world enough to actually see, but maybe they actually use some form of electromagnetic radiation that is much more intense, and that the light we see is just the lower or upper part of the spectrum of their adapted sense. Of course that's all speculation.
*takes notes for the soon-to-be-arriving update of his FAQ*
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