Re: vision correction for dim satellites

From: Judy May (tandembike@worldnet.att.net)
Date: Thu Sep 15 2005 - 14:35:45 EDT

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    A few list-members have written me with questions regarding my post
    concerning Night Myopia yesterday.  I would like to add some additional
    information.
    
    ONE LISTMEMBER QUESTION:
    >> 
    >> Are you saying that you went w/o glasses
    >> before and having glasses (the correction) helped?
    >> 
    
        No, I did not intend that meaning in my Email.  But as I understand
    it, that is not a factor at all.  And as a matter of fact, I can present
    to you both cases:
    
        I am nearsighted, with a little astigmatism, and have worn glasses
    most of my life.  I have my eyes checked often, and have done so
    recently, so my prescription is current.  When I am experimenting with
    the night myopia corrective lens set, I hold the lenses in front of my
    glasses, almost touching.  That is when I can realize the benifit by
    actually being able to discern dimmer stars.  If I were to order a new
    set of glasses to correct night myopia, the correction would be added to
    my existing prescription, and I would use those glasses only for
    observing the night sky.
    
        For the other case, take my husband.  Greg has never worn glasses. 
    He has excellent eyesight.  Though he has not had his eyes examined
    recently, he feels he has no optical problems.  Greg was blown away when
    he tried using the flipper set to view the stars.  He seemed to have
    even more success than I with an improvement in the limiting magnitude
    that was visible!  His case seems to fit the above asked question to a
    tee.  So provided  the doctor found nothing else wrong with his eyes,
    Greg would wind up with a pair of glasses useful only for observing
    satellites and the night sky.
    
        And the way I understand it, these eyeglasses are not considered to
    improve vision when using binoculars or a telescope.  Any correction for
    night myopia would come inherently from you actually focusing the
    instrument for yourself.  (By the way, that point is one argument
    against the "one perfectly attained focus on a telescope is good for all
    observers" school of thought at star parties.)
    
            --- Judy
    
     
       _~O  __O        Judy May     tandembike@worldnet.att.net       
     _-\<,_-\<,_       
    (*)/---|/-(*)      Life is a journey ...    Enjoy the ride!
    
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