I was looking around the internet for information on slig eyes and found this:
:
Underneath its mask, a Slig has two compound eyes that are dark coloured (they do not themselves glow red) These eyes do not grow when a Slig is given steroid treatment, so Big Bro Sligs’ eyes are pathetically small compared to their huge heads
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Hope this helps.
(for those who don't know compound eyes are the eyes on flies, bees, wasps ect)