Multifocal ocular lens having intermediate-distance vision correction region formed in central part of vision correction area
First Claim
1. 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.
1 Assignment
0 Petitions
Accused Products
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, wherein the vision correction area further includes a central intermediate-distance vision correction region which has a third optical power value for intermediate vision correction between the first and second optical power values and which is located in a central portion of the vision correction area such that the distant and near vision correction regions are located radially outwardly of the central intermediate-distance vision correction region.
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Citations
42 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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9. A multifocal ocular lens according to claim 1, wherein said optical power value y of said varying-power section of said central intermediate-distance vision correction region at a radial distance x from said common optical center axis is represented by one of the two following equations:
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10. A multifocal ocular lens according to claim 1, wherein said distant and near vision correction regions are formed radially outwardly of and concentrically with said central intermediate-distance vision correction region, and said at least one constant-power section consists of a single central constant-power section which has a center located on an optical center of said central intermediate-distance vision correction region and whose optical power value is closer to the optical power value of a radially outer one of said distant and near vision correction regions, than to the optical power value of the other radially inner one of said distant and near vision correction regions, which other radially inner one is located radially outwardly of and adjacent to said central intermediate-distance vision correction region.
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11. A multifocal ocular lens according to claim 1, wherein said optical center axis of said vision correction area is offset from a geometrical center axis of said ocular lens by a distance of not larger than 2.0 mm.
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12. A multifocal ocular lens according to claim 1, wherein either one of opposite surfaces of said ocular lens has a toric portion corresponding to said vision correction area.
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13. 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 consisting of a single central varying-power section whose optical power continuously varies in a radial direction from a first extreme value at an optical center axis of said vision correction area, to a second extreme value which is the optical power value of a radially inner one of said distant and near vision correction regions, said first extreme value being closer to the optical power value of the other radially outer one of said distant and near vision correction regions. - View Dependent Claims (14, 15, 16, 17)
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18. 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:
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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 includes at least one constant-power section whose optical power value is constant and intermediate between said first and second optical power values, said distant and near vision correction regions are formed radially outwardly of and concentrically with said central intermediate-distance vision correction region, and said at least one constant-power section consists of a single central constant-power section which has a center located on an optical center of said central intermediate-distance vision correction region and whose optical power value is closer to the optical power value of said distant vision correction regions, than to the optical power value of said near vision correction regions, said near vision correction region being located radially outwardly of and adjacent to said central intermediate-distance vision correction region, and said distant vision correction region have said first optical power value Pc (Dptr.) and being located radially outwardly of said near vision correction region having said second optical power value Pb (Dptr.) which is a sum of said first optical power value Pc and an additional value ADD (Dptr.), the optical power value Pa (Dptr.) of said single central constant-power section of said central intermediate-distance vision correction region being determined so as to satisfy the following formula;
- View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. 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:
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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, said distant and near vision correction regions are formed radially outwardly of and concentrically with said central intermediate-distance vision correction region, and said at least one constant-power section of said central intermediate-distance vision correction region includes a radially inner first constant-power section and a radially outer second constant-power section which have respective different optical power values, the optical power value of said radially inner first constant-power section being closer to the optical power value of a radially inner one of said distant and near vision correction regions, than the optical power value of said radially outer second constant-power section. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. 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:
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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, and said distant and near vision correction regions are formed radially outwardly of and concentrically with said central intermediate-distance vision correction region which functions as a first intermediate-distance vision correction region, and said vision correction area further includes a second intermediate-distance vision correction region which is interposed between said distant and near vision correction regions and which has a fourth optical power value between said first and second optical power values. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40)
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38. A multifocal ocular lens according to claim 32, wherein said second intermediate-distance vision correction region has a radial dimension of 0.1-2.0 mm.
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39. A multifocal ocular lens according to claim 32, wherein said optical center axis of said vision correction area is offset from a geometrical center axis of said ocular lens by a distance of not larger than 2.0 mm.
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40. A multifocal ocular lens according to claim 32, wherein either one of opposite surfaces of said ocular lens has a toric portion corresponding to said vision correction area.
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41. 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:
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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, and said vision correction area has an optical center axis which is offset from a geometrical center axis of said ocular lens by a distance of not larger than 2.0 mm.
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42. 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:
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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, and either one of opposite surfaces of said ocular lens has a toric portion corresponding to said vision correction area.
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Specification