In this video Dr. Dan Kuebler is describing how the camera-like eye, present in a variety of animal species (including humans), is an example of "convergence". It's just a good way to harness light and if we reran evolution the camera-like eye would almost certainly be prominent in the biological landscape.
More biological evolution resources
Why Does Evolution Work at All? [VIDEO]
Theories of Evolution Before Darwin
Did the Universe have a Beginning? Alexander Vilenkin [VIDEO]