Light must pass through layers of neurons before reaching your eyes' photoreceptors
The human retina is built 'backward,' requiring light to travel through several layers of neurons and blood vessels before it can reach the light-sensing photoreceptors.
In an architectural quirk of evolution, light must penetrate a 100-micron path of neural tissue before striking the rods and cones at the very back of the eye. To minimize distortion, the eye uses specialized Müller glia cells that act as living fiber-optic cables, guiding photons directly to the sensors with minimal scattering.
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