RU-2026112445-A - MULTIFOCAL EYE LENSES

Inventors

• Лу, Вэй
• ЧОЙ, Миоунг-Таек
• СЮЙ, Чжигуан
• ЛИ, Санеол
• ЛИ, Шинвоок
• КАРСОН, Дэниэл Р.

Assignees

• АЛЬКОН ИНК.

Dates

Publication Date

20260505

Application Date

20240926

Priority Date

20230926

Claims (20)

1. 1. A multifocal ophthalmic lens comprising:
2. an optical element having a base curvature corresponding to the base optical power; and
3. a diffractive element, wherein the diffractive element creates constructive interference in at least four successive diffraction orders, wherein the constructive interference creates a near focus, a far focus, and an intermediate focus between the near focus and the far focus, and
4. wherein the diffraction element comprises a plurality of annular diffraction steps, wherein two or more annular diffraction steps are defined by a profile having a curvilinear slope and a peak, and
5. the diffraction efficiency of at least one of the diffraction orders is less than ten percent.
6. 2. The multifocal ophthalmic lens of claim 1, wherein each of the plurality of annular diffractive stages has a curvilinear slope, a peak, and a linear slope.
7. 3. The multifocal ophthalmic lens of claim 2, wherein the plurality of annular diffractive steps comprise a repeating group of three echelettes.
8. 4. The multifocal ophthalmic lens of claim 3, wherein the first slope with a curved edge approaching the peak of one or more diffractive steps corresponds to a diffractive sagittal profile having at least four successive diffractive orders.
9. 5. The multifocal ophthalmic lens of claim 1, wherein each of the plurality of annular diffractive steps has a less pronounced slope opposite the curved edge.
10. 6. The multifocal ophthalmic lens of claim 1, wherein the curved edge faces the center of the multifocal ophthalmic lens.
11. 7. The multifocal ophthalmic lens of claim 1, wherein the linear slope is directed toward the outer edge of the multifocal ophthalmic lens.
12. 8. The multifocal ophthalmic lens of claim 1, wherein the first order diffraction efficiency is from five percent to nine percent.
13. 9. The multifocal ophthalmic lens of claim 1, wherein the first order diffraction efficiency is nine percent.
14. 10. The multifocal ophthalmic lens of claim 1, wherein the lens is an intraocular lens (IOL).
15. 11. The multifocal ophthalmic lens of claim 1, wherein the at least four successive diffraction orders are (0, +1, +2, +3).
16. 12. The multifocal ophthalmic lens of claim 11, wherein the diffraction efficiency of the +1 diffraction order is suppressed.
17. 13. A multifocal ophthalmic lens according to claim 1, wherein the near focus corresponds to vision at 40 cm and the intermediate focus corresponds to vision at 60 cm.
18. 14. A multifocal ophthalmic lens according to claim 1, in which:
19. The diffraction efficiency for zero-order diffraction is 45% to 50%; the diffraction efficiency for first-order diffraction is 7% to 9%;
20. the diffraction efficiency for second-order diffraction is at least 15% to 20%; and