| 摘要 |
PURPOSE: An off-axis poly-focal point optical lens is provided to improve an eyesight correction capability of the lens by enhancing focusing on a focal region wider than that of conventional non-curved lenses. CONSTITUTION: An off-axis poly-focal point optical lens forms at least one of a concave surface(Sconcave) and a convex surface(Sconvex) as an off-axis non-curved region. A cross section of the off-axis non-curved region is formed as one of either side besides the cross points of two curves(C1,C2) each having its center at two points spaced from a predetermined distance(off-axis distance) from a center of the lens. The either side besides the cross points of two curves is formed by an inner symmetrical region of two curves joining at one point(cross point). The off-axis non-curved region has a substantial cone shape as a whole.
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