If you don't want it to happen, you're probably better off. Most FoLCs aren't used to Clark's eyes glowing. I'm pretty sure it never happened in the series, and that's the important thing.
Nope, it definitely did happen in the series, but as with all these things, they weren't consistent about it. There's a scene, for example, where Clark has swapped bodies with someone else (Woody someone). Woody Somebody threatens Lois, and we get a close-up of his eyes glowing red. There may have been other occasions, but I can't think of any more specifics right now.
Anyway, the beauty of the series' lack of consistency is that you can pretty much choose the option which suits your story <g>. Oh, and I'm with the others on the heat vision being invisible to the naked eye - no red rays or other special effects.
Yvonne
