What's the difference between 190 and 180 degree fisheye lenses?

I'd like to buy one for an iphone 5 but I don't quite understand the differences between those lenses. Please explain thoroughly.

If you hold your arms straight out to your sides, that is 180 degrees. Now swing both arms back a little. That is 190 degrees.

These shots were taken with a lens that "sees" 183°, just over the definition of a fisheye lens which is a field of view of 180°

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In this shot, you can see the person standing next to the camera and the toe of one of my shoes. You can also see why it is difficult to get good shots when shooting in full sun. The shadow of the camera, neck strap and lens cover a lot of the subject.

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That said, the 190° degree field of view will make it more difficult for you to keep your feet out of the shot.

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