Okay I did a quick search for how exactly a fire was started in Survivor with a pair of glasses.
Quote:
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In another season, Yau-man, started his teams fire with a pair of glasses. He held the lens over the coconut husks fibers in direct sunlight to start the fire. After the smaller fire was started, the team added more kindling until the fire was going and added larger pieces of wood to make a campfire to stay warm with.
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If I remember correctly, I think it actually take hours of direct sunlight into the lenses for it to start a fire, thus requiring a great deal of patience. I don't know what attribute that would apply to, maybe the ability to stay calm. I'd also imagine the "camp" ability might come into play.
What does everyone else think?