Fresnel Card Lens

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A fresnel card lens is a magnifying glass the size and shape of a credit card. Such a lens is excellent for wilderness First Aid Kits and Survival Kits since it is extremely thin and lightweight, yet will allow splinters, small wounds, and insects to be easily viewed. A fresnel lens is also a good tool for viewing maps with small print. In a survival situation, a fresnel lens can be used to start a fire by focusing sunlight onto a tinder.

Fresnel lenses are frequently available for free in optometrists' offices.