Lens element
AssigneeEssilor International
InventorGuillaume Giraudet
Life of this patent
Estimating the term…
Abstract
A lens element adapted to a wearer and intended to be worn in front of an eye of the wearer, the lens element comprising:—a refraction area having a refractive power based on a prescribed refractive power Px for 5 said eye of the wearer and comprising at least a central zone,—a plurality of optical elements having an optical function of not focusing an image on the retina of the eye of the wearer, wherein the optical elements are organized based at least on the prescribed refractive power Px and the functional asymmetries over the visual field of the wearer.
Claims19
A lens element adapted to a wearer and intended to be worn in front of an eye of the wearer, the lens element comprising:
- a refraction area having a refractive power based on a prescribed refractive power Px for said eye of the wearer and comprising at least a central zone;
- and
- a plurality of optical elements having an optical function of not focusing an image on a retina of the eye of the wearer,
- wherein the optical elements are organized based at least on the prescribed refractive power Px and functional asymmetries over a visual field of the wearer, and
- wherein the lens element is divided in five complementary zones, the central zone and four quadrants at 45° and at least one of density of optical elements is lower in the lower and left quadrants than in the higher and right quadrant or optical power of the optical elements is higher in the lower and left quadrants than in the higher and right quadrant.
A method for determining a lens element, the lens element including:
- a refraction area having a refractive power based on a prescribed refractive power Px for an eye of a wearer and comprising at least a central zone, and a plurality of optical elements having an optical function of not focusing an image on a retina of the eye of the wearer, the method comprising:
- obtaining wearer's data, the wearer's data comprising at least prescription data relating to the prescribed refractive power Px;
- obtaining asymmetries data, the asymmetries data relating to the wearer's functional asymmetries over a visual field;
- and
- optimizing at least one parameter of the optical elements based on the wearer's data and asymmetries data,
- wherein the lens element is adapted to the wearer and intended to be worn in front of the eye of the wearer, the lens element including
- the refraction area having the refractive power based on the prescribed refractive power Px for said eye of the wearer and comprising at least the central zone, and
- the plurality of optical elements having the optical function of not focusing the image on the retina of the eye of the wearer,
- wherein the optical elements are organized based at least on the prescribed refractive power Px and functional asymmetries over the visual field of the wearer, and
- wherein the lens element is divided in five complementary zones, the central zone and four quadrants at 45° and at least one of density of optical elements is lower in the lower and left quadrants than in the higher and right quadrant or optical power of the optical elements is higher in the lower and left quadrants than in the higher and right quadrant.
A lens element adapted to a wearer and intended to be worn in front of an eye of the wearer, the lens element comprising:
- a refraction area having a refractive power based on a prescribed refractive power Px for said eye of the wearer and comprising at least a central zone;
- and
- a plurality of optical elements having an optical function of not focusing an image on a retina of the eye of the wearer,
- wherein the optical elements are organized based at least on the prescribed refractive power Px and functional asymmetries over a visual field of the wearer, and
- wherein the optical elements are diffractive Pi-Fresnel microlenses.
Dependencies are inferred from the claim text.