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  • FIGS. 1a to 1f illustrate prior art techniques of marking contact lenses, specifically, FIG. 1a is a front view of a sphero-cylindrical contact lens having orientation marks indicating the prism ballast on the lens for holding the lens in a particular position; FIG. 1b is a front view of a contact lens having printed or engraved marks; FIGS. 1c, 1d, 1e and 1f are a plan and a side view of a non-in
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