How the retina works
namdiesttocs at mindspring.com
Fri Jul 2 17:07:56 EST 2004
"Wil Hadden" <ask at me.com> wrote in news:2km36lF3l0skU1 at uni-berlin.de:
> I picked up on the the light passing though all the layers as well,
> what is the relevance of this not happening at the fovea?
> Or to be more precise, do you know why light passes through all the
> layers first?
The fovea does our highest acuity work, so the most direct path for light
seems to have evolved there. As for why light passes through all the other
layers, noones come up with a good reason for that. Maybe it has some
protective function for the receptors, maybe the retina is mechanically
more stable that way, maybe its just an evolutionary quick. FWIW, I seem
to recall being told that the octopus retina is not layered this way, but I
can't vouch for the info
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