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Our lens:
Accommodation is not enough: you also need convergence.
Retina
When light hits the rod (or cone) the rhodopsin is broken down and cell hyperpolarizes. So less activity when there is light.
Purkinje shift: the sensitivity to higher wavelengths is less in the dark because rods are insensitive to red (long wavelengths).
Cones are not sensitive to low amounts of light.
Temporal summation: photons reaching a rod add up over time, so fewer are necessary for a response.
What if one of the cone types is missing? Then you are color deficient.
There is always photon noise.
So:
We do not perceive light, we perceive changes in light (intensity) across space and/or time.
Horizontal cells:
Amacrine cells (not very important for exam)
Bipolar cells (important):
Center-surround organisation
Three types of ganglion cells
Center-surround is important!
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