Maid RPG has you roll for the colors of your maid's uniform, hair, and eye colors all on the same table. This is perfectly normal, except that one of the options is "Transparent." If you can't wrap your brain around the idea of transparent eyes, consider yourself lucky.
Be comforted: The color you roll is for the iris only, and a transparent iris would mean you'd see the blood cells in the eye. So transparent means "shifty red" here.
Somehow, being a bald, naked maid with "just" creepy red eyes is not comforting.
Though wasn't the transparent option listed as "transparent/rainbow"? So if transparent doesn't make sense, you use rainbow colour, and I dunno about you, but I find rainbow eyes very Moe.