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(meteorobs) Spectacles and LM

Pierre wrote:
>>>I've asked a number of eye experts, and their explanation seem to be
>>>that because contact lens are "closer" to the eye than glasses are,
>>>tiny objects (like stars) look sharper and more accurate during
>>>nighttime conditions. Could that make sense?
        Makes great sense to me, in fact, I had already intuitively
suspected it.  The distance from the eye to the lens (with glasses) will
vary slightly over a given period.  With contacts it will always be the
same.  Pierre, you described my experience in switching between the two
almost exactly!  In fact, I couldn't think of any better way (including
eye charts) to realize the difference between glasses and contacts than
going out under the stars!

Mark wrote:
>>>I would think the glasses would do the same if made correctly. I
>>>wear glasses (have never tried contacts) and do put up with the
fogging in
>>>winter.
        The answer may lie in the optical precision of the glasses.
Perhaps it would require a higher grade of optics than most
manufacturers are willing to attempt to sell.  Just my guess.

>>>But I would think there are serious drawbacks to contacts as well.
>>>Friends of mine who wear contacts have told me that sometimes the
contact
>>>irritates their eye due to dirt or something getting "behind" the
contact.
>>>They also stated that the contact severely irritates their eye when
they are
>>>overly tired. Both of these seem probable while observing.
       No doubt this can be a problem, Mark, but VERY easy to overcome.
    A:  Give your eyes a rest from the contacts by wearing glasses (and
taking a nap, which is always good to do before an observing session) a
few hours before the observing session.
    B: clean the darn things right before you go out to observe.  Then
they will be VERY comfortable.  And clearer!
    C:  have some rewetting drops handy in your observing kit.

Old Four Eyes,
Kim Y.


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