B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
88/40
B29D 11/00 (2006.01) G02C 7/04 (2006.01)
Patent
CA 1333757
A novel contact lens and a method of making the contact lens, said lens having an asymmetrically positioned and weighted presbyopic correction zone so that the presbyopic zone naturally positions itself lowermost in relation to the user's eye, the method involving the steps of providing a contact lens blank having a posterior surface conforming to the corneal requirements of the patient, forming an initial anterior surface on the lens blank corresponding to the required presbyopic correction, and then forming a second anterior surface on the lens blank in offset relation to the initial surface particularly to remove the initial surface and intersect smoothly therewith to form the presbyopic correction zone. The second anterior surface portion of the lens blank may have a corrective surface conforming with a greater distance correction of a user's prescription than the aforesaid near distance correction and which smoothly intersects the first formed surface to leave a residual of such firm formed surface which is of generally crescent shape. A third anterior surface portion of the lens blank with a corrective surface conforming with far distance correction of the user's prescription may be formed which smoothly intersects the second formed surface portion to leave a residual thereof between the first formed surface and the far distance surface.
512313
Gowling Lafleur Henderson Llp
Miller Gregory N.
LandOfFree
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