摘要:
A process for designing an ophthalmic progressive eyeglass comprises providing an initial front surface and an initial back surface. Respective addition values of front and back surfaces of the eyeglass are varied based on said initial front and back surfaces using a surface derivation tool. These surface addition values are selected so that the eyeglass exhibits an eyeglass addition value which matches a wearer's prescription and a value for a design feature which matches a target value. Said target value may be used for customizing the ophthalmic progressive eyeglass. The process does not require point-to-point surface optimization.
摘要:
The invention relates to a finished or semi-finished lens which comprises: a disc containing all the points of the lens that have the same abscissa and the same ordinate as points located within a circle in the reference plane having a diameter of 30 millimeters and centered on the prism reference point; a progression length of less than 14.5 millimeters; a first specific point having a cylinder value equal to the maximum cylinder value of all the points of the lens located in the nasal area and in the disc; and a second specific point having a cylinder value equal to the maximum cylinder value of all the points of the lens located in the temporal area and in the disc; a first ratio between: the maximum gradient of the cylinder for the points of the lens that have the same abscissa and the same ordinate as the points located on segments connecting the mounting cross to the first and second specific points, and surface addition of less than 0.095 per millimeter; and a second ratio between: the maximum cylinder value of the first and second specific points, and surface addition of no more than 0.85. The invention enhances the comfort of the wearer.
摘要:
The invention relates to a lens having certain properties, including: a circle grouping together all the points of the lens having the same abscissa and the same ordinate as points located on a circle in the reference plane, having a diameter of 35 millimetres and centred on a point located 8.5 millimetres below the mounting cross and horizontally offset on the nasal side by 1.25 millimetres; a disc grouping together all the points of the lens having the same abscissa and the same ordinate as points located inside said circle; a progression length of less than 14.5 millimetres; a ratio difference between the value of the cylinder and the surface addition of less than 0.2 as an absolute value for every pair of points of the lens that are symmetrical relative to the mounting cross and have the same ordinate as the mounting cross, and an abscissa with an absolute value of less than 20 millimetres; a first ratio between: the maximum cylinder value for all the points of the circle; and the surface addition of less than 0.7; and a second ratio between: the maximum cylinder value for all the points of the disc; and the surface addition of no more than 1.05. The invention is suitable for improving the comfort of the wearer.
摘要:
The invention relates to a finished or semi-finished lens which comprises: a disc containing all the points of the lens that have the same abscissa and the same ordinate as points located within a circle in the reference plane having a diameter of 30 millimetres and centred on the prism reference point; a progression length of less than 14.5 millimetres; a first specific point having a cylinder value equal to the maximum cylinder value of all the points of the lens located in the nasal area and in the disc; and a second specific point having a cylinder value equal to the maximum cylinder value of all the points of the lens located in the temporal area and in the disc; a first ratio between: the maximum gradient of the cylinder for the points of the lens that have the same abscissa and the same ordinate as the points located on segments connecting the mounting cross to the first and second specific points, and surface addition of less than 0.095 per millimetre; and a second ratio between: the maximum cylinder value of the first and second specific points, and surface addition of no more than 0.85. The invention enhances the comfort of the wearer.
摘要:
A process for designing an ophthalmic progressive eyeglass comprises providing an initial front surface and an initial back surface. Respective addition values of front and back surfaces of the eyeglass are varied based on said initial front and back surfaces using a surface derivation tool. These surface addition values are selected so that the eyeglass exhibits an eyeglass addition value which matches a wearer's prescription and a value for a design feature which matches a target value. Said target value may be used for customizing the ophthalmic progressive eyeglass. The process does not require point-to-point surface optimization.
摘要:
The invention relates to a method for determining an ophthalmic lens for a person (i.sub.1, i.sub.2, i.sub.3) to wear said lens, comprising the following steps: i) determination of the size (T.sub.1, T.sub.2, T.sub.3) or height of the eyes (H.sub.1, H.sub.2, H.sub.3) of the person to wear the lens; and ii) calculation of at least one characteristic of the ophthalmic lens according to the size (T.sub.1, T.sub.2, T.sub.3) or the height of the eyes (H.sub.1, H.sub.2, H.sub.3) of the person to wear the lens. The ophthalmic lens can be progressive strength or unifocal. The invention also relates to an optimization method and a method for producing an ophthalmic lens implementing such a definition method. The invention further relates to a set of lenses having at least one characteristic that depends on the size and the height of the eyes of the person to wear the lens.
摘要:
The invention relates to a method for determining an aspherization layer for an ophthalmic lens for a wearer for whom a power and an astigmatism have been prescribed. The method can be used equally satisfactorily on a unifocal or a multifocal lens. The invention also extends to the method for determining an ophthalmic lens from an aspoherization layer obtained by the method. The invention improves the optical performance of lenses obtained from semi-finished lenses in which the complex surface is unknown.
摘要:
A method for determining the value of the inset of a progressive addition lens according to a wearer comprising the steps of: providing convergence data, determining from the convergence data the inset of the progressive addition lens considering at least the convergence data and the prismatic effect of the progressive addition lens.
摘要:
A method for determining the value of the inset of a progressive addition lens according to a wearer comprising the steps of: providing convergence data, determining from the convergence data the inset of the progressive addition lens considering at least the convergence data and the prismatic effect of the progressive addition lens.
摘要:
The invention relates to a method for determining an ophthalmic lens for a person (i1, i2, i3) to wear said lens, comprising the following steps: i) determination of the size (T1, T2, T3) or height of the eyes (H1, H2, H3) of the person to wear the lens; and ii) calculation of at least one characteristic of the ophthalmic lens according to the size (T1, T2, T3) or the height of the eyes (H1, H2, H3) of the person to wear the lens. The ophthalmic lens can be progressive strength or unifocal. The invention also relates to an optimisation method and a method for producing an ophthalmic lens implementing such a definition method. The invention further relates to a set of lenses having at least one characteristic that depends on the size and the height of the eyes of the person to wear the lens.