The glial cell type produced by retinal stem cells. A relatively unspecialised cell compared to the retinal neurons - no elaborate tree-like dendrites, etc. This cell type may be able to dedifferentiate back in to a retinal stem cell under certain conditions. Whether this happen in adults is controversial.
This group had an interesting paper - Muller cells act to refract light, helping to channel it down through the retina to photoreceptors and preventing distortion. Simpler explanation here
Picture here.
Apart from this, they have the usual glial cell function of support and nutrient supply to neurons. That cute knife-and-fork graphic can be used - if you decide to use prints. They might get a little confusing in the overlay, but for separate neuron cut-outs...
Images
Golgi (black)stained pics
and here
Fluorescent pics here
And here
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