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    Re: Lunar distance accuracy
    From: Frank Reed
    Date: 2007 Oct 27, 22:45 -0400

    And I see Michael Daly has already posted this much more detailed reply:
    "A larger pupil exposes more of the cornea/lens to the light and allows
    more opportunity for astigmatism to come into the image.  If you have
    generally good vision but off-axis astigmatism, it is not noticeable
    until the pupil is large.  Larger pupils can also reveal early cataracts
    (they tend to start from the outside of the lens) that can mess up the
    image.
    
    These kinds of things start to show up in daylight for some folks who
    start using various eye medications that cause pupil dilation (like some
    glaucoma meds)."
    
    Very glad you joined the group, Mike! BTW, in case you hadn't guessed, I was
    the one who posted that anonymous invitation on the Discussion page for the
    Wikipedia lunar distance article.
    
     -FER
    http://www.HistoricalAtlas.com/lunars
    
    
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