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The way I look at it, if you have to go thru the trouble of carting around pin hole glasses, why not just carry a spare pair or two?

If you get caught out somewhere, then you may have to make from...

I always have spare glasses, mostly in vehicles and cabins, but there are times, in the field that I don't carry them in my day pack.

I have found that if you make a peep hole with you thumb and...