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Fig. 7. The absorption of sky light as a function of the angle of the incident
light for different states of pupil closure for a photoreceptor with a distal
rhabdomere diameter of 2 µm and one sensitizing pigment molecule per
rhodopsin (R+S). The pupil adaptation is given by the pupil distance,
h. (A) Photon absorption per second from a patch of blue sky of 1
square degree seen under an angle 
. (B) Normalization shows that the
angular sensitivity function distinctly narrows upon light adaptation. The
vertical lines indicate the angle of incident light that is focused on the
rhabdomere border.
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