Presbyopia lens with pupil size correction based on level of refractive error
Ophthalmic lenses for the treatment of presbyopia may be improved to enhance the visual experience of the patient. By adjusting the optical design of presbyopic lenses to account for changes in pupil size due to the degree of myopia or hyperopia, an enhanced visual experience may be achieved independent of the level of ametropia.
1. A method for improving ophthalmic lenses for the treatment of presbyopia, the method comprising the steps of:
creating a base optical design with predetermined features for a lens for treating presbyopia;
determining the power profile of the base optical design, P nominal ; and
scaling the radial location of the predetermined features within the base optical design in proportion to the population average pupil size for the degree of ametropia of a target individual by determining a magnification factor M that relates the pupil sizes at a range of luminance levels for the ametropia level of the base design to the pupil sizes for the same luminance levels for the population average at the targeted degree of ametropia; and
scaling the power profile of the base design, P nominal , according to the following equations to obtain the power profile at the prescribed prescription, Rx, or degree of ametropia,
P 2 ( r )= P nominal ( r )+ SA eye *r 2 +Rx−RX nominal , and
P Rx ( r )= P 2 ( M*r )− SA eye *r 2 ,
wherein SA eye is the spherical aberration and r is the radial distance from the center of the lens.
2. The method for improving ophthalmic lenses for the treatment of presbyopia according to claim 1 , wherein the step of creating a base optical design comprises creating a concentric ring design.
3. The method for improving ophthalmic lenses for the treatment of presbyopia according to claim 1 , wherein the step of creating a base optical design comprises creating a continuous power profile design.
4. The method for improving ophthalmic lenses for the treatment of presbyopia according to claim 1 , wherein the step of creating a base optical design comprises creating an aspheric surface design.
5. A method for improving ophthalmic lenses for the treatment of presbyopia, the method comprising the steps of:
creating a base optical design with predetermined features for a lens for treating presbyopia;
determining the power profile of the base optical design, P nominal ; and
scaling the radial location of the predetermined features within the base optical design in proportion to a measured pupil size of an individual by determining a magnification factor M that relates the pupil sizes at a range of luminance levels for the ametropia level of the base design to the measured pupil size for the same luminance of the individual; and
scaling the power profile of the base design, P nominal , according to the following equations to obtain the power profile at the prescribed prescription, Rx, or degree of ametropia,
P 2 ( r )= P nominal ( r )+ SA eye *r 2 +Rx−RX nominal , and
P Rx ( r )= P 2 ( M*r )− SA eye *r 2 ,
wherein SA eye is the spherical aberration and r is the radial distance from the center of the lens.
6. The method for improving ophthalmic lenses for the treatment of presbyopia according to claim 5 , wherein the step of creating a base optical design comprises creating a concentric ring design.
7. The method for improving ophthalmic lenses for the treatment of presbyopia according to claim 5 , wherein the step of creating a base optical design comprises creating a continuous power profile design.
8. The method for improving ophthalmic lenses for the treatment of presbyopia according to claim 5 , wherein the step of creating a base optical design comprises creating an aspheric surface design.
9. A method for improving ophthalmic lenses for the treatment of presbyopia, the method comprising the steps of:
creating a base optical design with predetermined features for a lens for treating presbyopia by;
determining the power profile of the base optical design, P nominal ; and
scaling the radial location of the predetermined features within the base optical design in proportion to the population average pupil size for the degree of ametropia of a target individual by determining magnification factor factors M 1 through M n that relates the pupil sizes at a range of luminance levels for the ametropia level of the base design to the pupil sizes for the same luminance levels for the population average at the targeted degree of ametropia; and
scaling the power profile of the base design, P nominal , according to the following equations to obtain the power profile at the prescribed prescription, Rx, or degree of ametropia,
P 2 ( r )= P nominal ( r )+ SA eye *r 2 +Rx−RX nominal , and
P RX ( r )= P 2 ( M 1 *r+M 2 *r 2 + . . . )− SA eye *r 2 ,
wherein SA eye is the spherical aberration and r is the radial distance from the center of the lens.
10. The method for improving ophthalmic lenses for the treatment of presbyopia according to claim 9 , wherein the step of creating a base optical design comprises creating a concentric ring design.
11. The method for improving ophthalmic lenses for the treatment of presbyopia according to claim 9 , wherein the step of creating a base optical design comprises creating a continuous power profile design.
12. The method for improving ophthalmic lenses for the treatment of presbyopia according to claim 9 , wherein the step of creating a base optical design comprises creating an aspheric surface design.
13. A method for improving ophthalmic lenses for the treatment of presbyopia, the method comprising the steps of:
creating a base optical design with predetermined features for a lens for treating presbyopia;
determining the power profile of the base optical design, P nominal ; and
scaling the radial location of the predetermined features within the base optical design in proportion to a measured pupil size of an individual by determining magnification factors M 1 through M n that relates the pupil sizes at a range of luminance levels for the ametropia level of the base design to the measured pupil size for the same luminance of the individual; and
scaling the power profile of the base design, P nominal , according to the following equations to obtain the power profile at the prescribed prescription, Rx, or degree of ametropia,
P 2 ( r )= P nominal ( r )+ SA eye *r 2 +Rx−RX nominal , and
P RX ( r )= P 2 ( M 1 *r+M 2 *r 2 + . . . )− SA eye *r 2 ,
wherein SA eye is the spherical aberration and r is the radial distance from the center of the lens.
14. The method for improving ophthalmic lenses for the treatment of presbyopia according to claim 13 , wherein the step of creating a base optical design comprises creating a concentric ring design.
15. The method for improving ophthalmic lenses for the treatment of presbyopia according to claim 13 , wherein the step of creating a base optical design comprises creating a continuous power profile design.
16. The method for improving ophthalmic lenses for the treatment of presbyopia according to claim 13 , wherein the step of creating a base optical design comprises creating an aspheric surface design.