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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