I used to carry spare glasses with sun screen clip on lenses and a neck coard attached. Contract are too hard to mess with in a survival situation. Cold shaking hands, dirty hands, lack of a mirror if needed, lack of wetting solution, diirt in the eyes, etc.
I, in my contact wearing days, preferred extra glasses.
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Our most important survival tool is our brain, and for many, that tool is way underused! SBRaider
Head Cat Herder