Here's a PV. " Diopter" should surely be "dioptre". Or are you a US
citizen Dave ?
-----Original Message-----
From:
On Behalf Of Dave Torr
Sent: Wednesday, October 10, 2007 3:49 PM
To: Peter Shute
Cc:
Subject: Contact lenses vs glasses for birding
When I first started serious birding I switched to contact lenses to
improve my experience - and for several years it worked fine, until I
developed some reaction to the lenses and had to go back to glasses. I
agree that - especially if you have astigmatism - contacts can be
erratic.
The other problem with glasses I find is rain!
Seems you are not adjusting your lens settings correctly. The technique
is to see which lens has the diopter setting. If it is the right one
then close your right eye and focus on a distant object. Then close left
eye (and open right one) and refocus using ONLY the diopter setting.
This should then be fine in all conditions (until it gets knocked!)
O
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