Request InfoDocter Optics Inc.Precision-molded micro half-ball lenses from crown (nd = 1.5230), borosilicate (nd = 1.4719) and high-refractive-index (nd = 1.6200) glass materials are available from Docter Optics Inc. in 4-, 5- and 6-mm-diameter sizes and with standard, truncated and extended center thicknesses. The lenses' hemisphere first surface is molded, and the plano second surface is ground and polished. Fly's-eye array versions also are available. 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