How the retina works

Wil Hadden ask at
Fri Jul 2 16:42:41 EST 2004

"Scott Seidman" <namdiesttocs at> wrote in message
news:Xns951AABC9D6A30scottseidmanmindspri at
> Lateral inhibition is the mechanism for the whole center-surround
> antagonism operation of the retina.  If you think about it, it not only
> enhances edge detection, it increases the dynamic range of the entire
> retina.

I thought this happens thought feedback from the horizontla cells and from the
photoreceptors themsleves.
When this happens is it not just a relative shift in sensitivity?

> An interesting tidbit-- the light has to pass through the ganglion,
> bipolar, amacrine, and horizontal cells, as well as the cell body of the
> photoreceptors, before hitting the light sensitive parts of the
> photoreceptor.  At the fovea, this isn't as true-- the upper layers are
> sort of pushed aside
> Scott

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?


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