After thinking about it, this has really started to bug me. Lets assume that TF eye's work as a lens, like ours, that process the light that passes into them into images. That means light has to pass into them rather than be output by them. If their eyes glow, they shouldn't be able to see. Looking back, glowing eyes weren't used on TFs at all really. The only time their eyes would glow is when they'd surge briefly in the G1 cartoon, such as when prime died. Recent comics have really taken this over the top though where their eyes are like frikkin bulbs lighting up their heads. So how do people feel about this. Glowing eyes just have stopped making sense to me now, and I'd rather see them used sparingly from now on.