Take a picture!
A tip for IPhone users to get good eye pics: Use your back camera, flash on, 3 second countdown if you need time to get in the right spot, then edit the imagine and crop your eye.
That results in really good pictures!
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Sorry It's Blurry, But Here's My Eye :3
My Eye, Using The Steps From The Description
That is my bad eye, I have an astigmatism. You can actually see how my iris is misshapen! (Lower left of iris bends weird)