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Originally Posted by The Lone Ranger
Quote:
Originally Posted by LadyShea
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A light source is bright when it is close to us because the photons are close together and so the eyes registers lots of them. As the object draws farther away, or if we move away from it, it begins to seem dimmer because the photons radiating off the object are DIVERGING. Therefore fewer photons meet the eye. That is all there is to it.
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This is why the shape, size and receptor density allows longer distance vision, and also is the limiting set of factors.
For larger sensors there is simply more area for more photons to strike. Sensors with a high density of receptors can see further because they collect more photons per location on the sensors (birds of prey have twice the density of receptors compared to humans and additional color receptors). |
Yup. And nocturnal animals have relatively larger eyes than do their diurnal counterparts. |
How do any these facts refute Lessans' claims regarding efferent vision?