What are the steps in a basic eyewear bench alignment?
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For all frames, make sure nose pad arms flow along edges of lenses and temples are parallel to each other. Right side up 4-point stance: bottom of each lens, tip of each temple. Upside down 3-point stance: across top of lenses and top of each temple at point of bend. Temples should be tight and lenses should be tight in the frame. There should be no marks on the frame, no lens warpage or distortion, and no gaps between lens and frame. The frame should be completely clean. For plastic frames, ensure there are no rolled frame grooves, heat marks or burns. For metal frames, there should be no gaps at the closure or temple to end-piece junction, no damaged screws, and no sharp screw edges. Screw style, size and color must match the frame and each other. On rimless frames, ensure there’s no dirt in the groove or monofilament. Grooves must be even and string must be secure in the groove. Monofilament should be the correct color, and screw style, size and color must match the frame and each other. On drill mount frames, there should be no cracks around the drill holes, no tool marks on lenses, and no damaged or sharp edge screws. Screw style, size and color must match the frame and each other.
-- Paul Zito, president, Encore Optics LLC , South Windsor, Conn.