Ahahah, odf.

I've been googling for images of a real dissected human eye.

If cut up dead people bothers you, don't go here.

http://www.oddee.com/item_96547.aspx

There's an eye 2/3 of the way down. The iris looks convex to me. But it's hard to tell because the eye is turned a little bit.

I found lots of dissected cow eyes - the iris on those is clearly convex, but that's got nothing to do with humans, perhaps.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)