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Einta
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>>184190 There are rods and cones.
Three+ types of cones, which received color. Generally Red/Green/Blue. However, there is a decent amount evidence that humans are blocked tetrachromats - that we have a fourth set of cones that receive UV-range light but are blocked due to the opacity of our eyes themselves.
Rods receive light generically - greyscale. While each cone is connected to a single nerve, sets of three rods are connected to a single nerve - with no way of distinguishing which sent the signal.
In general, your central vision is cone-heavy. While viewing dim light, rods are far more influential than cones. Cones are used for high-light-level color vision.
The number is "set" but varies - from individual to individual and from eye to eye. Also, undoubtedly some cells die. I can't remember if they're replaced or not. Probably are, at least to some degree.
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