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These lenses were used for burning out wounds to prevent infection, light fires or as a magnifier for craftsmen. It is also believed that the lenses were made out of trial and error as the mathmatics needed to formulate the curvature of the lens had not yet been invented.
It has been noted that the quality of these lenses has not been duplicated until the 1950s. It is possible that these ancient people possessed the technology to create these lenses for use in telescopes.