How to take a cool picture of your eye?

I was wondering how to take a very clear picture of my eye and get like all the detail. I have an iPhone, a regular camera and an underwater camera. I don't know how people get theirs so clear! Does anyone have any suggestions?

You need a willing subject & a macro lens, plus good light - stand your subject next to a window.

Example of mine;

  • Why does it hurt when you put sharpie on your skin & then take a picture with flash on the iPhone? Okay, so there's this thing at my school where you do this: 1. Draw a black sharpie square on your hand 2. Take off your phone case 3. Put your phone camera directly on the skin where your sharpie mark is 4. Turn on the flash on your phone and then take a picture. It hurts and stings a little bit. It's like a small shock. Why is that?
  • What's wrong with my eye? (picture)? It's a little hard to see, maybe, because my iPhone couldn't seem to get a good picture. It's like 3/4 blue/gray, and 1/4 hazel-brownish looking? What is it? And how rare is it? I've only seen animals with it, no people. I know people have it but I've never met a person with different colors in their eyes at the same time.
  • What's the iPhone app that gives you cool picture backgrounds? I'm talking about the the ones where you can make your collage/pictures tumblr like backgrounds like food and galaxy's and stuff.
  • Iphone app that changes your eye color? - 1 I saw a girl on instagram change the color of her eye to like grey and she said I wish that was my real eye color #playingwithapps. Is there an app that does that? Lol Anybody know any? Omfg.___. Sorry wrong category I thought i had changed it!