okay so i haven't given this as much thought as i'd like to admit... i've always imagined it as having a similar texture to keratin (sorry) or teeth (extra sorry) though i've also considered the chillingly unfortunate reality it could have the same gummy texture as an actual eyeball (extra, extra, deeply sorry). but, on a "haven't developed this thought much" level i considered it either being similar to a parietal eye (and whatever that would entail...) or functionally perceiving light in a way that would give garleans a natural advantage in their environment where they've lost an advantage wrt not being able to channel aether normally. i'd like to think about it more because it's interesting to me.............