Lens element
AssigneeEssilor International
InventorsMatthieu Guillot, Björn Drobe
Life of this patent
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Abstract
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.
Claims18
A method for treatment using a lens comprising:
- obtaining a first refractive power corresponding to a prescription for correcting an abnormal refraction of an eye of a person;
- and
- applying the lens having the first refractive power in a first portion and a second refractive power, different from the first refractive power, in a second portion in front of the eye of the person, wherein the second portion includes a plurality of optical elements which defocus an image such that the image is not focused on a retina of the eye, and
- wherein a mean sphere of the plurality of optical elements varies from an optical center towards a peripheral part of the lens,
- wherein the mean sphere is defined as
- SPH
- mean
- =
- 1
- 2
-
- (
- SPH
- min
- +
- SPH
- max
- )
- ,
- where
- SPH
- min
- =
- (
- n
- -
- 1
- )
- *
- CURV
- min
- =
- n
- -
- 1
- R
- max
- ,
- and
- SPH
- min
- =
- (
- n
- -
- 1
- )
- *
- CURV
- min
- =
- n
- -
- 1
- R
- max
- .
A method for treatment of myopia or presbyopia using a lens comprising:
- obtaining a first refractive power corresponding to a prescription of a person;
- and
- applying the lens having the first refractive power in a first portion and a second refractive power, different from the first refractive power, in a second portion in front of an eye of a wearer,
- wherein the second portion includes at least one microlens that defocuses an image such that the image is not focused on a retina of the eye,
- wherein the at least one microlens has an asphericity between 0.1D and 3D.
A method for treatment using a lens comprising:
- obtaining a first refractive power corresponding to a prescription of a person;
- and
- applying the lens having the first refractive power in a first portion and a second refractive power, different from the first refractive power, in a second portion in front of an eye of a wearer,
- wherein the second portion includes a plurality of optical elements which are non-contiguous, and
- wherein the plurality of optical elements are configured so that along at least one section of the lens, a mean sphere of the optical elements varies from a first point of the at least one section towards a periphery of the at least one section,
- wherein the mean sphere is defined as
- SPH
- mean
- =
- 1
- 2
-
- (
- SPH
- min
- +
- SPH
- max
- )
- ,
- where
- SPH
- min
- =
- (
- n
- -
- 1
- )
- *
- CURV
- min
- =
- n
- -
- 1
- R
- max
- ,
- and
- SPH
- min
- =
- (
- n
- -
- 1
- )
- *
- CURV
- min
- =
- n
- -
- 1
- R
- max
- .
Dependencies are inferred from the claim text.