| 摘要 |
<p>A gasket (20) defining an axially extending bore (30) therethrough, a front mold (40) having an edge circumscribing the front mold, wherein the edge is of a size to be complementarily received within at least a portion of the bore of the gasket so that the edge and the bore form a seal therebetween, and a rear mold (50) having a rim circumscribing the rear mold, wherein the rim is sized to be complementarily received within at least a portion of the bore so that the rim and the bore form a seal therebetween. When the front mold and the rear mold are both disposed within the bore of the gasket, a volume (31) is formed between the back surface of the front mold and the front surface of the rear mold and the interior of the gasket. A selected one of the front mold or rear mold is axially and slidably movable within the bore relative to the other mold disposed within the bore to a desired one of the plurality of axial separation distances between the molds, whereby the volume is different for each separation distance. The different volumes correspond to different lens powers, so that the gasket can form different lenses.</p> |
