Patent ID: 6357876
Filing Date: 2002-03-19
Classification: G02C

Abstract:
A multifocal ocular lens having a vision correction area including at least one distant vision correction region having a first optical power value for distant vision correction and at least one near vision correction region having a second optical power value for near vision correction, characterized in that:said vision correction area further includes a central intermediate-distance vision correction region which has a third optical power value for intermediate vision correction between said first and second optical power values and which is located in a central portion of said vision correction area such that said distant and near vision correction regions are located radially outwardly of said central intermediate-distance vision correction region, said central intermediate-distance vision correction region including at least one constant-power section whose optical power value is constant and intermediate between said first and second optical power values and a varying-power section which is located radially outwardly of said at least one constant-power section and whose optical power value continuously varies in a radial direction from the optical power value of a radially outermost one of said at least one constant power section to one of said first and second optical power values of a corresponding one of said distant and near vision correction regions, which corresponding one is located adjacent to said varying-power section.