Perception of light intensity and pupil size

Discussion in 'Optometry Archives' started by Pauli Soininen, May 28, 2005.

  1. I was trying to find studies on how pupil size affects the brightness (and
    level of detail) of the perceived picture. I didn't really find what I was
    looking for, maybe somebody could help?

    For example, if we have 5.00mm pupil (area ~20mm^2). Then pupil changes to
    7.07 (area ~40mm^2). The amount of photons passing to retina is now
    increased 100%. How much brighter is the bright and dark parts of the image
    now seen? In my own experiment, that type of pupil size change does not have
    any effect on the brightness (while the slower retinal adapation is very
    clearly noticeable as a separate phenomenon). I am, though, probably a very
    bad candidate to test this because of my LASIK operated eyes with spherical
    aberration.

    I'm sure it is effective to have pupil size varying from 1.5mm to 5.0mm or
    so (at least small pupil will help prevent damage to the retina caused by
    too much light). But is there any situation where pupil size above 5.0mm or
    so would be beneficial in any way?
     
    Pauli Soininen, May 28, 2005
    #1
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