Re:Darwin got it right... (Score 0)

I was just curious as to how a light sensitive cell located inside a skull and embedded in brain tissue would ever migrate towards light. Is there enough light to penetrate the skull and surrounding tissues to make this happen over time? Assuming the migration took many generations and successive mutations occured in approximately the same region o the head, is there really any advantage gained by having a light sensitive cell half way between the original location and the midpoint?