| 摘要 |
<p>A progressive optic (10) has an optical preform (30) wherein the radius of curvature of the surface is altered by forming discrete spherical portions (20) across the surface. A thin intermediate layer (40), having a different refractive index from the optical preform (30), is then cast over the formed optical preform surface. The optical preform (30) having the thin intermediate layer (40) is then cast with a resin superstrate layer (60) which restores the curve of the optic (10). Each spherical section (50), defined by spherical portions (20) and corresponding portions of outer surface of the superstrate layer (60), alters the spherical power of the adjacent spherical section (50) by about .03D to .05D.</p> |
