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Re: (meteorobs) Aids for night vision?
Whilst most of the adjustment for differing light levels is done in the
retina, expanding the pupil to a larger size *might* have some value, if
it doesn't produce poorer images. I'm not sure if the fully dark adapted
eye can have the pupil further enlarged, although with the pupil typically
dilating less far with age, perhaps older folks could benefit? Anyway,
an extract from Deadly Nightshade, belladonna (beautiful lady) was long used
as an eye drop, not for better night vision, but to enlarge the pupil and
increase the appearance of beauty. The pupil enlarges with interpersonal
attraction and sexual arousal, and it is well defined that people with
artificially enlarged pupils are seen as more attractive. This also applies
to advertisments where pupil size is enlarged to produce a more positive
reaction by viewers.
I'm not suggesting anyone try this!
Robert H. McNaught
rmn@aaocbn.aaodot gov.au
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