This week on Knock Knock Eye, Will talks about his hate for eye color changing surgery due to it damaging a perfectly healthy eyeball. He then goes into the main topic of the day, the Iris. Will tells you all he knows about the Iris, from the anatomy, to why it's there, the purpose, and more.

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Today's episode is brought to you by the Nuance Dragon Ambient Experience (DAX). It's like having a virtual Jonathan in your pocket. If you would like to learn more about DAX, check out http://nuance.com/discoverDAX and ask your provider for the DAX experience.

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