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^ 1. Number of photons a rod is sensitive to.
^ 5. Lowest number of photoreceptors inputing into each central foveal retinal ganglion cell.
^ 100. Average number of rod and cone input into each retinal ganglion cell.
^ Thousands. Number of rod and cone input per peripheral retinal ganglion cell in a human retina.
^ 0.7 to 1.5 million. Number of retinal ganglion cells in a human retina.
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