Optical system
An optical system intended to be worn in front of an eye of a wearer including an optical lens having at least a control point and an optical device that has a plurality of optical elements, the optical device being attached on a surface of the optical lens or encapsulated into the optical lens, wherein each optical element has simultaneously two different optical functions, and the optical device and the optical lens are configured so that the absolute value of the difference between a measured optical power at the control point of the optical system and the optical power corresponding to the prescription for said eye of the person is smaller than or equal to 0.12 diopter.
1. An optical system intended to be worn in front of an eye of a wearer comprising:
an optical lens having at least a control point; and
an optical device having a plurality of optical elements, the optical device being attached on a surface of the optical lens or encapsulated into the optical lens,
wherein each optical element simultaneously has two different optical functions including a first optical function and a second optical function,
wherein the first optical function of at least part of the optical element is to focus an image on a retina of the eye when the optical system is worn in standard wearing conditions, whatever an eye gaze direction,
wherein the second optical function of at least part of the optical elements is to not focus an image on the retina of the eye in said standard wearing conditions and instead to be focused either in front or behind the retina of the wearer in peripheral vision, and
wherein the optical device and the optical lens are configured so that an absolute value of a difference between a measured optical power at the control point of the optical system and a second optical power corresponding to a prescription for said eye of the wearer is smaller than or equal to 0.12 diopter.
2. The optical system according to claim 1 , wherein, for at least one optical element, an absolute value of a difference between at least one third optical power measured through said optical element of said optical system and a fourth optical power measured through a corresponding part of the optical lens alone is smaller than or equal to 0.25 diopter.
3. The optical system according to claim 2 , wherein the first optical function is an optical function with a mean optical power smaller than or equal to 0.25 diopter.
4. The optical system according to claim 2 , wherein the second optical function of at least part of optical elements has a mean optical power greater than or equal to 0.5 diopter.
5. The optical system according to claim 2 , wherein the second optical function of at least part of optical elements is to not focus an image on a retina of the eye when the optical system is worn in standard wearing conditions to slow down progression of abnormal refraction of the eye.
6. The optical system according to claim 1 , wherein the first optical function is an optical function with a mean optical power smaller than or equal to 0.25 diopter.
7. The optical system according to claim 6 , wherein the second optical function of at least part of optical elements has the mean optical power greater than or equal to 0.5 diopter.
8. The optical system according to claim 6 , wherein the second optical function of at least part of the optical elements is to not focus an image on a retina of the eye when the optical system is worn in standard wearing conditions to slow down progression of abnormal refraction of the eye.
9. The optical system according to claim 1 , wherein the second optical function of at least part of the optical elements has a mean optical power greater than or equal to 0.5 diopter.
10. The optical system according to claim 1 , wherein the second optical function of at least part of the optical elements is to not focus an image on a retina of the eye when the optical system is worn in standard wearing conditions to slow down progression of abnormal refraction of the eye.
11. The optical system according to claim 1 , wherein the optical device is attached on a front surface of the optical lens or on a back surface of the optical lens or is inserted inside the optical lens.
12. The optical system according to claim 1 , wherein at least part of the optical elements are contiguous.
13. The optical system according to claim 1 , wherein at least part of the optical elements are arranged along a plurality of concentric rings.
14. The optical system according to claim 1 , wherein at least part of the optical elements are diffractive lenses.
15. The optical system according to claim 14 , wherein the diffractive lenses comprise two main diffractive orders, a first main diffractive order providing a first mean optical power smaller in absolute value than or equal to 0.25 diopter, and a second main diffractive order providing a second mean optical power greater than or equal to 0.5 diopter.
16. The optical system according to claim 1 , wherein at least part of the optical elements are π-Fresnel lenses.
17. The optical system according to claim 1 , wherein the optical elements have a squared shape contour or a hexagonal shape contour and are arranged according to a predefined array including one of a square and a hexagonal array.
18. An optical device intended to be placed on a surface of an optical lens in order to add an optical power of said optical lens, said optical device comprising:
a plurality of optical elements, wherein each optical element has two simultaneously different optical functions that provide simultaneously:
a first mean optical power smaller in absolute value than or equal to 0.25 diopter, and
a second mean optical power greater than or equal to 0.5 diopter.
19. A method for providing an optical system intended to be worn in front of an eye of a wearer, comprising:
providing an optical lens configured to provide to the wearer, in standard wearing conditions, a correction optical power based on a prescription for the wearer for correcting an abnormal refraction of said eye of the wearer,
providing an optical device intended to be placed on a surface of the optical lens in order to add an optical power of said optical lens, said optical device including a plurality of optical elements, wherein each optical element has two simultaneously different optical functions including a first optical function and a second optical function that provide simultaneously a first mean optical power smaller in absolute value than or equal to 0.25 diopter and a second mean optical power greater than or equal to 0.5 diopter, and
forming the optical system by placing the optical device on one surface of the optical lens or by encapsulating the optical device into the optical lens,
wherein the first optical function of at least part of the optical element is to focus an image on a retina of the eye when the optical system is worn in standard wearing conditions, whatever an eye gaze direction, and
wherein the second optical function of at least part of the optical elements is to not focus an image on the retina of the eye in said standard wearing conditions and instead to be focused either in front or behind the retina of the wearer in peripheral vision.
20. The method according to claim 19 , wherein the method further comprises casting the optical system to generate a casted lens and during the casting providing the optical device to be inserted in the casted lens.