Camera + was used to autofix the photo. I also enhanced the photo with the Apple's iOS photo app. (not iPhoto).
First of all take a decent close up photo of the eye. Getting too close will result in a blurry photo as the macro with the iPhone 5 isn't so great. The photo you see is a cropped one as I couldn't get any closer to get a good macro shot. If you have one of those macro lenses then you would get a clearer, sharper shot with no need to crop.
After cropping, I used Snapseed to add saturation to the eye. I sharpened the photo also.
Then I used Colorblast to put the photo in black in white and colored in only my eye.
I used Afterfocus for it's Vignette feature only.
and that's about it. Also I use Camera + to take the photo as it has a Anti-Shake feature so as I try to take a photo of my eye, it only takes a shot when the camera is most still, resulting in a clear sharper shot.
Why wait? Also, I was suprised how much HDR sharpens the image. I decided to upgrade to the iPhone 5 after seeing the picture quality and video stabilization. Amazing.