| 摘要 |
<p>Being restricted in the shape of an object-side refractive surface, an internally progressive refractive power lens is less likely to be thinned than an externally progressive refractive power lens. Here, an object-side refractive surface is shaped into a rotation-axis-symmetric aspheric surface where the curvature of a distal portion measuring reference point is smaller than that of a near portion measuring reference point, and an eye-ball-side refractive surface is shaped by synthesizing a progressive refractive surfac, an astigmatic refractive surface and a correction aspheric surface at wearing. Accordingly, a thinned progressive refractive power lens with a minimum shaking/distortion can be offered at low costs.</p> |
