| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a progressive refractive power lens capable of reducing distortion thereof. <P>SOLUTION: In a progressive refractive power lens 10, a curvature CY (DP) at a distant portion measurement reference point DP on a prime meridian A of an object side refractive surface 11 in a lateral direction and a curvature CT (DP) at the distant portion measurement reference point DP thereon in a longitudinal direction satisfy a following expression (1): CY (DP)=CT (DP), while a curvature CY (P) at a point P positioned at a progressive portion 3 of a near portion 2 side from a progressive starting point S and a near portion 2 on the prime meridian A in a lateral direction and a curvature CT (P) at the point P in a longitudinal direction satisfying a following expression (2): CY (P)>CT (P). <P>COPYRIGHT: (C)2012,JPO&INPIT |
