Certains contenus de cette application ne sont pas disponibles pour le moment.
Si cette situation persiste, veuillez nous contacter àObservations et contact
1. (US20170351117) Multifocal ophthalmic spectacle lens arranged to output a supplementary image
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

Claims

1. A multifocal ophthalmic spectacle lens to correct a wearer's ophthalmic vision and comprising:
a back surface and a front surface, where the back surface is positioned closest to a wearer's eye when the multifocal ophthalmic spectacle lens is worn,
a light guide optical element arranged to output a supplementary image to the wearer through an exit surface of said light guide optical element, where the exit surface, the back surface, and
an optical material located between said exit surface and said back surface form an optical device,
wherein said optical device comprises an area of stabilized optical power; and
wherein the exit surface is defined by an angular aperture contour, denoted AC(α,β), α being the eye declination angle and β being the eye azimuth angle, wherein the angular aperture contour, AC(α,β), is situated in the area of stabilized optical power where the optical device fulfils the requirement of following equation (E1) when (α,β) is within the contour AC(α,β):

          −0.5 Diopter≤ P(α,β)− P mean≤0.5 Diopter;  (E1)
where P(α,β) is the dioptric power of the optical device and P mean is the mean dioptric power of the optical device within the contour AC(α,β), wherein P(α,β) and P mean are expressed in Diopter.
2. The multifocal ophthalmic spectacle lens as claimed in claim 1, according to which the α variation range within AC(α,β) and the β variation range within AC(α,β) are each equal or greater to 5°.
3. The multifocal ophthalmic spectacle lens as claimed in claim 1, according to which the optical device is located in an area of stabilized astigmatism, wherein the exit surface is defined by an angular aperture contour, denoted AC(α,β), α being the eye declination angle and β being the eye azimuth angle, wherein the angular aperture contour, AC (α,β) is situated in the area of stabilized astigmatism so that the optical device fulfils the requirement of following equation (E2) when (α,β) is within the contour AC(α,β):

          0 Diopter≤UnAsti(α,β)≤0.5 Diopter;  (E2):
where UnAsti(α,β) is the unwanted astigmatism value of the optical device and wherein UnAsti is expressed in Diopter.
4. The multifocal ophthalmic spectacle lens as claimed in claim 1, according to which the area of stabilized optical power results from the optical power generated by the geometry of the back surface.
5. The multifocal ophthalmic spectacle lens as claimed in claim 1, according to which the multifocal ophthalmic spectacle lens is a progressive addition spectacle lens chosen within the list consisting of a spectacle lens comprising a far vision zone, an intermediate vision zone and a near vision zone; a spectacle lens comprising an intermediate vision zone and a near vision zone; a spectacle lens comprising a far vision zone and an intermediate vision zone.
6. The multifocal ophthalmic spectacle lens as claimed in claim 5, according to which the multifocal ophthalmic spectacle lens is a spectacle lens comprising a far vision zone, an intermediate vision zone and a near vision zone or a spectacle lens comprising, a far vision zone and an intermediate vision zone, where the back surface is a progressive surface or a regressive surface and where the angular aperture contour, AC(α,β), is located in the far vision zone.
7. The multifocal ophthalmic spectacle lens as claimed in claim 5, according to which the multifocal ophthalmic spectacle lens is a spectacle lens comprising a far vision zone, an intermediate vision zone and a near vision zone or a spectacle lens comprising an intermediate vision zone and a near vision zone, where the back surface is a progressive surface or a regressive surface, and where the angular aperture contour, AC(α,β), is located in the near vision zone.
8. The multifocal ophthalmic spectacle lens as claimed in claim 5, according to which the back surface is a progressive surface or a regressive surface, and where the angular aperture contour, AC(α,β), is located in the temporal zone or in the nasal zone of the spectacle lens, in a zone where a meets the intermediate vision zone.
9. The multifocal ophthalmic spectacle lens as claimed in claim 5, according to which the front surface is a progressive surface and the back surface is a surface where the absolute value of the mean sphere value differences over said surface are equal to or less than 0.5 Diopter.
10. The multifocal ophthalmic spectacle lens as claimed in claim 5, according to which the back surface is a progressive surface or a regressive surface, and where the angular aperture contour, AC(α,β), is located in a part of the intermediate vision zone where the absolute values of the mean sphere value differences over said part of the intermediate vision zone are equal to or less than 0.5 Diopter.
11. The multifocal ophthalmic spectacle lens as claimed in claim 5, according to which the back surface is a progressive surface and comprising a surface discontinuity located around the angular aperture contour, AC(α,β).
12. The multifocal ophthalmic spectacle lens as claimed in claim 1, according to which the multifocal ophthalmic spectacle lens is chosen within the list consisting of bifocal lens and trifocal lens.
13. A method for calculating with a computer a multifocal ophthalmic spectacle lens to correct wearer's vision, the method comprising:
providing the multifocal ophthalmic spectacle lens having a back surface and a front surface where the back surface is positioned closest to a wearer's eye when the multifocal ophthalmic spectacle lens is worn, the multifocal ophthalmic spectacle lens comprising a light guide optical element arranged to output a supplementary image to the wearer through an exit surface of said light guide optical element, where the exit surface, the back surface and an optical material located between said exit surface and said back surface form an optical device so that said optical device is located in an area of stabilized optical power, and
calculating the geometry of the back surface and the geometry of the front surface using an optimization method involving a target lens that has a virtual optical function according to a wearer's prescription,
wherein the exit surface is defined by an angular aperture contour, denoted AC(α,β), α being the eye declination angle and β being the eye azimuth angle, and
wherein the angular aperture contour, AC(α,β), is situated in the area of stabilized optical power where the optical device fulfils the requirement of following equation (E1) when (α,β) is within the contour AC(α,β):

          −0.5 Diopter≤ P(α,β)− P mean≤0.5 Diopter;  (E1):
where P(α,β) is the dioptric power of the optical device and P mean is the mean dioptric power of the optical device within the contour AC(α,β), wherein P(α,β) and P mean are expressed in Diopter.