Progressive ophthalmic lens and method of producing one such lens
First Claim
1. A progressive ophthalmic lens comprising an anterior face, a posterior face and an intermediate medium producing variations in optical power and astigmatism when said lens is used by a wearer, in which said variations result from:
- a first contribution resulting from variations of a sphere and cylinder of the anterior face of the lens; and
a second contribution resulting from variations of at least one physical parameter of the lens distinct from the sphere and cylinder of the anterior face, and distinct from the resulting optical effects of the sphere and cylinder of the anterior face,and in which values of the physical parameter at different points on the lens are adapted so that the second contribution produces customization of the variations in optical power and astigmatism of the lens for a wearer as a function of at least one behavioral characteristic specific to the wearer,the lens being characterized in that it has a prescribed optical power and a prescribed astigmatism resulting from values of another physical parameter in different points of the lens, said other physical parameter being distinct from the sphere and cylinder of the anterior face, and from the physical parameter which produces the second contribution to the variations in optical power and astigmatism of the lens.
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Accused Products
Abstract
The invention relates to a progressive ophthalmic lens and to a method of producing one such lens. Variations in the optical power and the astigmatism of a progressive ophthalmic lens (10) result from (i) spherical and cylindrical variations in the anterior face (2) of the lens and (ii) variations in another physical unit of the lens. In this way, it is possible to customise the design of the progressive lens as a function of at least one behavioural characteristic of the lens wearer. Said customisation can be repeated by modulating the values of the physical unit between the different points of the lens. As a result, progressive lenses with different designs can be obtained from identical semi-finished lenses. The physical unit can comprise the sphere and the cylinder of the posterior face of the lens (3).
19 Citations
24 Claims
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1. A progressive ophthalmic lens comprising an anterior face, a posterior face and an intermediate medium producing variations in optical power and astigmatism when said lens is used by a wearer, in which said variations result from:
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a first contribution resulting from variations of a sphere and cylinder of the anterior face of the lens; and a second contribution resulting from variations of at least one physical parameter of the lens distinct from the sphere and cylinder of the anterior face, and distinct from the resulting optical effects of the sphere and cylinder of the anterior face, and in which values of the physical parameter at different points on the lens are adapted so that the second contribution produces customization of the variations in optical power and astigmatism of the lens for a wearer as a function of at least one behavioral characteristic specific to the wearer, the lens being characterized in that it has a prescribed optical power and a prescribed astigmatism resulting from values of another physical parameter in different points of the lens, said other physical parameter being distinct from the sphere and cylinder of the anterior face, and from the physical parameter which produces the second contribution to the variations in optical power and astigmatism of the lens. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10)
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8. A progressive ophthalmic lens comprising an anterior face, a posterior face and an intermediate medium producing variations in optical power and astigmatism when said lens is used by a wearer, in which said variations result from:
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a first contribution resulting from variations of a sphere and cylinder of the anterior face of the lens; and a second contribution resulting from variations of at least one physical parameter of the lens distinct from the sphere and cylinder of the anterior face, and in which values of the physical parameter at different points on the lens are adapted so that the second contribution produces customization of the variations in optical power and astigmatism of the lens as a function of at least one behavioral characteristic of the wearer, the lens being characterized in that it has a prescribed optical power and a prescribed astigmatism resulting from values of another physical parameter in different points of the lens, said other physical parameter being distinct from the sphere and cylinder of the anterior face, and from the physical parameter which produces the second contribution to the variations in optical power and astigmatism of the lens, and the variations of the physical parameter are adapted so that a maximum value for astigmatism reached at a point located in lateral parts of the lens and/or a location of said point is modified with respect to an effective maximum value of astigmatism and/or an effective location, respectively, resulting only from variations of the sphere and of the cylinder of the anterior face of the lens.
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11. A method for producing a progressive ophthalmic lens comprising an anterior face, a posterior face and an intermediate medium, the method comprising the following steps:
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producing a semifinished lens in which the anterior face has variations in a sphere and cylinder in order to obtain a first contribution to variations in optical power and astigmatism of the lens when said lens is used by a wearer; measuring at least one behavioral characteristic of a wearer of the lens; determining values of a physical parameter of the lens distinct from the sphere and cylinder of the anterior face, and distinct from the resulting optical effects of the sphere and cylinder of the anterior face, so that a second contribution to the variations in optical power and astigmatism of the lens results from variations of said physical parameter between different points on the lens, said second contribution achieving customization of the variations of optical power and astigmatism of the lens for the wearer according to the behavioral characteristic measured specific to the wearer, and modulating the physical parameter so as to obtain said second contribution, wherein the values of another physical parameter distinct from the sphere and cylinder of the anterior face, and from the physical parameter that produces the second contribution to the variations in optical power and astigmatism of the lens at different points on the lens are determined so as to obtain a prescribed optical power and a prescribed astigmatism for the lens. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24)
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22. A method for producing a progressive ophthalmic lens comprising an anterior face, a posterior face and an intermediate medium, the method comprising the following steps:
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producing a semifinished lens in which the anterior face has variations in a sphere and cylinder in order to obtain a first contribution to variations in optical power and astigmatism of the lens when said lens is used by a wearer; measuring at least one behavioral characteristic of a wearer of the lens; determining values of a physical parameter of the lens distinct from the sphere and cylinder of the anterior face, so that a second contribution to the variations in optical power and astigmatism of the lens results from variations of said physical parameter between different points on the lens, said second contribution achieving customization of the variations of optical power and astigmatism of the lens according to the behavioral characteristic measured, and modulating the physical parameter so as to obtain said second contribution, wherein the values of another physical parameter distinct from the sphere and cylinder of the anterior face, and from the physical parameter that produces the second contribution to the variations in optical power and astigmatism of the lens at different points on the lens are determined so as to obtain a prescribed optical power and a prescribed astigmatism for the lens, wherein modulation of the physical parameter is further determined so that the second contribution to the variations in astigmatism of the lens modifies a maximum astigmatism value reached at a point located in lateral parts of the lens and/or a location of said point, with respect to a maximum effective astigmatism value and/or an effective location, respectively, resulting only from the first contribution.
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Specification