Procedure for designing a progressive ophthalmic lens and corresponding lens
Method for designing a progressive ophthalmic lens with a top area between a vision area and a top edge of the lens, and a bottom area between a near vision area and a bottom edge of the lens. Selecting a predesigned lens, lateral aberrations which are redistributed around an outer area, defined according to a frame chosen by the lens user, so that at least on one of intersections between top, bottom and outer areas, the aberrations adopt values higher than those in the predesigned lens.
1. A progressive ophthalmic lens, comprising:
a far vision area, a near vision area and a passage that extends between said far vision area and said near vision area,
wherein between said far vision area and a top edge of said progressive lens there extends a top area and between said near vision area and a bottom edge of said lens there extends a bottom area;
a useful area, defined according to a perimeter of a preselected frame, and an area between the perimeter and an outer area outside the useful area,
wherein said useful area divides said top area into a top outer area and a top inner area and said bottom area into a bottom outer area and a bottom inner area, and
wherein in at least one of said top outer and bottom outer areas there is an arch of a contour line of a lens power progression associated astigmatism of value 0.25 Dp that extends along the corresponding top outer and bottom outer areas between two points of the frame perimeter.
2. Lens according to claim 1 , wherein the top inner and bottom inner areas have a lens power progression associated astigmatism less than 0.12.
3. Lens according to claim 1 , wherein the top inner and bottom inner areas have a lens power progression associated astigmatism less than 0.06.
4. Method for designing a progressive ophthalmic lens, where said lens includes a far vision area, a near vision area and a passage which extends between said far vision area and said near vision area, where between said far vision area and a top edge of said lens there extends a top area and between said near vision area and a bottom edge of said lens there extends a bottom area, comprising the following steps:
taking a user's physiological and prescription data,
selecting a frame,
obtaining the frame's perimeter,
optimizing the lens, by:
calculating objective power and prescription astigmatism values for the far vision area, the near vision area and the passage, according to the user's physiological and prescription data,
generating or selecting a predesigned lens having certain lateral aberration values, in the top and bottom areas,
defining a useful area according to the perimeter of the frame, and an outer area outside the useful area,
positioning the useful area in the lens where the useful area divides the top area into a top outer area and a top inner area, and the bottom area into a bottom outer area and a bottom inner area,
redistributing at least one of the lateral aberrations on the lens around the outer area allowing, at least in one of the top outer and bottom outer areas, values to be adopted that are higher than those on the predesigned lens; and
taking data of a position of the lens with respect to the user's eye based on the selected frame.
5. Method according to claim 4 , wherein the calculating is done according to the user's physiological and prescription details and the position data.
6. Method for designing a progressive ophthalmic lens, where said lens includes a far vision area, a near vision area and a passage which extends between said far vision area and said near vision area, where between said far vision area and a top edge of said lens there extends a top area and between said near vision area and a bottom edge of said lens there extends a bottom area, comprising the following steps:
taking a user's physiological and prescription data,
selecting a frame,
obtaining the frame's perimeter,
optimizing the lens, by:
calculating objective power and prescription astigmatism values for the far vision area, the near vision area and the passage, according to the user's physiological and prescription data,
generating or selecting a predesigned lens having certain lateral aberration values, in the top and bottom areas,
defining a useful area according to the perimeter of the frame, and an outer area outside the useful area,
positioning the useful area in the lens where the useful area divides the top area into a top outer area and a top inner area, and the bottom area into a bottom outer area and a bottom inner area, and
redistributing at least one of the lateral aberrations on the lens around the outer area allowing, at least in one of the top outer and bottom outer areas, values to be adopted that are higher than those on the predesigned lens,
wherein the redistributing is done by establishing a non null objective value of said lateral aberration for at least one of said top outer and bottom outer areas.
7. Method according to claim 6 , wherein said lateral aberration is a lens power progression associated astigmatism.
8. Method according to claim 6 , wherein an objective value of said lateral aberration is between 30% and 70% of a maximum value of said lateral aberration present in said useful area.
9. Method according to claim 8 , wherein an objective value of said lateral aberration is between 40% and 60% of the maximum value of said lateral aberration present in said useful area.
10. Method for designing a progressive ophthalmic lens, where said lens includes a far vision area, a near vision area and a passage which extends between said far vision area and said near vision area, where between said far vision area and a top edge of said lens there extends a top area and between said near vision area and a bottom edge of said lens there extends a bottom area, comprising the following steps:
taking a user's physiological and prescription data,
selecting a frame,
obtaining the frame's perimeter,
optimizing the lens, by:
calculating objective power and prescription astigmatism values for the far vision area, the near vision area and the passage, according to the user's physiological and prescription data,
generating or selecting a predesigned lens having certain lateral aberration values, in the top and bottom areas,
defining a useful area according to the perimeter of the frame, and an outer area outside the useful area,
positioning the useful area in the lens where the useful area divides the top area into a top outer area and a top inner area, and the bottom area into a bottom outer area and a bottom inner area,
redistributing at least one of the lateral aberrations on the lens around the outer area allowing, at least in one of the top outer and bottom outer areas, values to be adopted that are higher than those on the predesigned lens; and
wherein said optimizing further includes establishing initial parameters including objective power values, objective values of said lateral aberration, power and lateral aberration tolerance values and a weight function; and
wherein said optimizing is carried out via a merit function, where, for said outer area, tolerances of said lateral aberration are established that are greater than tolerances of said lateral aberration for said useful area.
11. Method according to claim 10 , wherein for said outer area, smaller weight function values are established than for said useful area.
12. Method according to claim 11 , wherein, for said outer area, normalized values are established smaller than 0.2.
13. Method according to claim 12 , wherein, for said outer area, normalized values are established less than 0.1.
14. Method for designing a progressive ophthalmic lens, where said lens includes a far vision area, a near vision area and a passage which extends between said far vision area and said near vision area, where between said far vision area and a top edge of said lens there extends a top area and between said near vision area and a bottom edge of said lens there extends a bottom area, comprising the following steps:
taking a user's physiological and prescription data,
selecting a frame,
obtaining the frame's perimeter,
optimizing the lens, by:
calculating objective power and prescription astigmatism values for the far vision area, the near vision area and the passage, according to the user's physiological and prescription data,
generating or selecting a predesigned lens having certain lateral aberration values, in the top and bottom areas,
defining a useful area according to the perimeter of the frame, and an outer area outside the useful area,
positioning the useful area in the lens where the useful area divides the top area into a top outer area and a top inner area, and the bottom area into a bottom outer area and a bottom inner area, and
redistributing at least one of the lateral aberrations on the lens around the outer area allowing, at least in one of the top outer and bottom outer areas, values to be adopted that are higher than those on the predesigned lens,
wherein the optimizing includes shifting at least one of nasal and temporal maximums of progression associated astigmatism present in said predesigned lens by moving said at least one nasal and temporal maximums away from said far vision and near vision areas and said passage, and
wherein, at least one of said nasal and temporal maximums is shifted until said at least one nasal and temporal maximums substantially coincides with said perimeter.
15. Method according to claim 14 , wherein nasal and temporal benchmarks are defined, and at least one of said nasal and temporal maximums is shifted until said at least one of said nasal and temporal maximums substantially coincides with a respective nasal or temporal benchmark.
16. Method for designing a progressive ophthalmic lens, where said lens includes a far vision area, a near vision area and a passage which extends between said far vision area and said near vision area, where between said far vision area and a top edge of said lens there extends a top area and between said near vision area and a bottom edge of said lens there extends a bottom area, comprising the following steps:
taking a user's physiological and prescription data,
selecting a frame,
obtaining the frame's perimeter,
optimizing the lens, by:
calculating objective power and prescription astigmatism values for the far vision area, the near vision area and the passage, according to the user's physiological and prescription data,
generating or selecting a predesigned lens having certain lateral aberration values, in the top and bottom areas,
defining a useful area according to the perimeter of the frame, and an outer area outside the useful area,
positioning the useful area in the lens where the useful area divides the top area into a top outer area and a top inner area, and the bottom area into a bottom outer area and a bottom inner area,
redistributing at least one of the lateral aberrations on the lens around the outer area allowing, at least in one of the top outer and bottom outer areas, values to be adopted that are higher than those on the predesigned lens; and
defining an ellipse of vision.
17. Finished progressive ophthalmic lens, comprising:
a far vision area, a near vision area and a passage that extends between said far vision area and said near vision area,
wherein between said far vision area and a top edge of said lens there extends a top area and between said near vision area and a bottom edge of said lens there extends a bottom area;
a useful area, defined according to a perimeter of a preselected frame, and an area between the perimeter and an outer area outside the useful area, where said useful area divides said top area into a top outer area and a top inner area and said bottom area into a bottom outer area and a bottom inner area, wherein at least one of said top outer and bottom outer areas there is a lens power progression associated astigmatism greater than 0.25 Dp,
wherein the top inner and bottom inner areas have a lens power progression associated astigmatism less than 0.12.
18. The lens according to claim 17 , wherein said top inner and bottom inner areas have a lens power progression associated astigmatism less than 0.06.