| 摘要 |
<p>A simultaneous vision lens (10) that incorporates a central aspheric optic zone (1) symmetrical to the central axis of the lens (10). Then, outwardly and concentric with this first optic zone (1) there is a second optic zone (2), i.e., a 'blending zone' that provides a rapid power shift over a small distance. Outwardly from the second zone (2) there is a third optic zone (3) providing for the intermediate and distance correction required by the patient, and a fourth optic zone (4) that provides for the blending of the optic zones to the continued circular structure of the lens outward to its periphery.</p> |
