What if you could hash a retina?

[Haze]

I recently began learning more about POS mining as opposed to POW mining, and believe that POS mining is the future. The problem that I've seen so far (most recently NXT) is initial distribution. What if every single person on earth is assigned the same amount of coins, that could then be exchanged an used? The individual's retina would be the 'private key' and the address would be the hash of their retina.

Just an idea that popped into my head that I thought I'd run by all of you