How did complex organs evolve via evolution?

Something like the eye, for example. Dawkins says first there was a patch of light-sensitive cells, then it was slightly curved, then very curved, then some liquid got trapped in there, then a lens formed, then muscles formed around the lens, etc. But each of these steps by random mutation is highly unlikely. Even if the odds of each step are 1/100, then you have (1/100) raised to the power of the number of steps required to evolve the eye. So if it took 100 favorable mutations, then it would be 100^100 power and the math just doesn't work out.
Added (1). When I say "the math doesn't work out" I mean the odds are staggering of this occurring via random mutations. Yes, I know that organisms with the favorable mutations survive, but that doesn't change the fact that 100^100 attempts are required. That number isn't even astronomical, it's absurd.

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