Lens element
A lens element worn in front of an eye of a person includes a refraction area having a first refractive power based on a prescription for correcting an abnormal refraction of the eye of the person and a second refractive power different from the first refractive power and a plurality of at least three optical elements, at least one optical element having an optical function of not focusing an image on the retina of the eye so as to slow down the progression of the abnormal refraction of the eye.
1. A lens element wearable in front of an eye, comprising:
a refraction area having a refractive power based on a prescription corresponding to the eye; and
at least two non-contiguous optical elements, at least one optical element having an optical function of not focusing an image on a retina of the eye to slow down a progression of an abnormal refraction of the eye,
wherein for every circular zone having a radius comprised between 2 and 4 mm including a geometrical center located at a distance of a framing reference that faces a pupil gazing straight ahead in standard wearing conditions greater or equal to said radius+5 mm, a ratio between a sum of areas of parts of the at least two non-contiguous optical elements located inside said circular zone and an area of said circular zone is comprised between 20% and 70%.
2. The lens element according to claim 1 , wherein the at least two non-contiguous optical elements are independent.
3. The lens element according to claim 1 , wherein the at least two non-contiguous optical elements are positioned on a network.
4. The lens element according to claim 3 , wherein the network is a structured network.
5. The lens element according to claim 1 , wherein the at least two non-contiguous optical elements are positioned along a plurality of concentric rings.
6. The lens element according to claim 1 , further comprising optical elements of the at least two non-contiguous optical elements positioned radially between two concentric rings.
7. The lens element according to claim 1 , wherein at least part of the at least two non-contiguous optical elements have a constant optical power and a discontinuous first derivative between two non-contiguous optical elements of the at least two non-contiguous optical elements.
8. The lens element according to claim 1 , wherein at least part of the at least two non-contiguous optical elements have a varying optical power and have a continuous first derivative of an outer surface of the lens element between two non-contiguous optical elements of the at least two non-contiguous optical elements.
9. The lens element according to claim 1 , wherein at least one of the at least two non-contiguous optical elements have an optical function of focusing an image on a position other than a retina.
10. The lens element according to claim 1 , wherein at least one of the at least two non-contiguous optical elements is a toric refractive micro-lens.
11. The lens element according to claim 1 , wherein the at least two non-contiguous optical elements are configured so that along at least one section of the lens element a mean sphere of the at least two non-contiguous optical elements increases from a center of said section towards a peripheral part of said section.
12. The lens element according to claim 1 , wherein the refractive area is formed as an area other than areas formed to include the at least two non-contiguous optical elements.
13. The lens element according to claim 1 , wherein the lens element further comprises at least four optical elements, the at least four optical elements being organized in at least two groups of non-contiguous optical elements, each group of non-contiguous optical elements being organized in at least two concentric rings having a same center, a concentric ring of each group of non-contiguous optical elements being defined by an inner diameter corresponding to a smallest circle that is tangent to at least one optical element of the respective group and an outer diameter corresponding to a largest circle that is tangent to at least one optical element of the respective group.
14. The lens element according to claim 1 , wherein a distance between two successive concentric rings of optical elements is greater than or equal to 5.0 mm, a distance between two successive concentric rings being defined by a difference between an inner diameter of a first concentric ring and an outer diameter of a second concentric ring, the second concentric ring being closer to a periphery of the lens element.
15. A lens element wearable in front of an eye, comprising:
a refraction area having a refractive power based on a prescription corresponding to the eye; and
at least two non-contiguous optical elements, at least one optical element having an optical function of not focusing an image on a retina of the eye to slow down a progression of an abnormal refraction of the eye,
wherein the at least two non-contiguous optical elements are configured so that along at least one section of the lens element a mean sphere of the at least two non-contiguous optical elements increases from a center of said section towards a peripheral part of said section.
16. A lens element wearable in front of an eye, comprising:
a refraction area having a refractive power based on a prescription corresponding to the eye; and
at least two optical elements, at least one optical element having an optical function of not focusing an image on a retina of the eye to slow down a progression of an abnormal refraction of the eye,
wherein for at least one zone having a radius comprised between 2 and 4 mm including a geometrical center located at a distance of a framing reference that faces a pupil gazing straight ahead in standard wearing conditions greater or equal to said radius+5 mm, a ratio between a sum of areas of parts of the at least two optical elements located inside said zone and an area of said zone is comprised between 20% and 70%.