article_snippet: the retina is the light-sensitive part of the eye, lining the inside of the eyeball.
article_snippet: Before arriving at the cones and rods, light must traverse the full thickness of the retina, with the retina layers of neurons and cell nuclei.
article_snippet: In the transparent retina, this higher density (and corresponding refractive index) means that glial cells can guide light, just like fibre-optic cables.
article_snippet: With colleagues at the Technion Medical School, we tested how light crosses guinea pig retinas.
article_snippet: Before arriving at the cones and rods, light must traverse the full thickness of the retina, with the retina layers of neurons and cell nuclei .
article_snippet: The result was easy to notice: in each layer of the retina us saw that light was not scattered evenly, but concentrated in a few spots.
article_snippet: a few spots were continued from layer to layer, thus creating elongated columns of light leading from the entrance of the retina down to the cones at the detection layer.
article_snippet: light was concentrated in elongated columns of light leading from the entrance of the retina up to ten times, compared to the average intensity.