TECHNICAL FIELD

The invention relates to a set of ophthalmic lenses, each ophthalmic lens of said set having at a point of optical reference a maximum power and each ophthalmic lens meeting an optical performance criterion.

The invention further relates to a method, for example implemented by computer means, for determining a set of ophthalmic lenses that can be manufactured from a semi-finished lens blank and to method of ordering an ophthalmic lens adapted for a wearer from an ophthalmic lens provider.

BACKGROUND OF THE INVENTION

An optical lens is generally manufactured in accordance with wearer specifications. In the case, for example, of an ophthalmic lens for the correction or improvement of eyesight, the ophthalmic lens is manufactured according to a wearer prescription corresponding to the visual requirements of that wearer. In addition, the shape and size of the spectacle frame supporting the ophthalmic lens may be taken into account. At least one of the surfaces of the ophthalmic lens is processed to provide in combination with the opposite surface an optical function according to the wearer prescription. The contour of the ophthalmic lens may be edged according to the shape of the spectacle frame on which the ophthalmic lens is to be mounted.

An optical lens is generally manufactured from an optical lens blank such as a semi-finished lens blank. A semi-finished lens blank generally has two opposing surfaces at least one of which is unfinished.

A semi-finished lens blank is selected from a set of different semi-finished lens blanks Generally, the semi-finished lens blank is selected from the set of semi-finished lens blanks based on the prescription of the wearer and optical performance criteria.

The unfinished surface of the lens blank is machined according to the wearer's prescription to provide the required surface of the optical lens. An optical lens having finished back and front surfaces is often referred to as an uncut optical lens. The uncut optical lens is edged according to a shape of a spectacle frame of the optical lens in order to obtain an edged or cut optical lens.

The existing lens manufacturing process requires having a set of different semi-finished lens blanks leading to storage and logistic costs.

Therefore, it appears that there is a need to optimize the set of semi-finished lens blank that is to be used to manufacture a set of optical lenses.

SUMMARY OF THE INVENTION

To this end, the invention proposes a set of ophthalmic lenses, each ophthalmic lens of said set has at a point of optical reference a maximum power and each ophthalmic lens meets an optical performance criterion in standard wearing conditions,

wherein

the range of maximum powers of the set of ophthalmic lenses is greater than or equal to 10 D, andall the ophthalmic lenses of the set of ophthalmic lenses have been manufactured from a set of semi-finished lens blank, each semi-finished lens blank having the same base curve.

The present invention reduces the semi-finished lens blank inventory/stock by using only one type of semi-finished lens blank lens for a large range of ophthalmic lenses while meeting optical performance criterion.

Advantageously, the present invention reduces the complexity of the ophthalmic lens manufacturing process and reduces the cost of said manufacturing process.

According to further embodiments which can be considered alone or in combination:each of the ophthalmic lenses of the set of ophthalmic lenses has an astigmatism amplitude at the point of optical reference greater than or equal to 0 D and smaller than or equal to 4 D and an astigmatism axis comprised between 0 and 180°; and/ornone of the ophthalmic lenses of the set of ophthalmic lenses is biconvex; and/orthe range of maximum powers of the set of ophthalmic lenses is greater than or equal to 11 D; and/orthe range of maximum powers of the set of ophthalmic lenses is greater than or equal to 12 D; and/orthe range of maximum powers of the set of ophthalmic lenses is greater than or equal to 13 D; and/orthe range of maximum powers of the set of ophthalmic lenses is greater than or equal to 14 D; and/orthe range of maximum powers of the set of ophthalmic lenses is greater than or equal to 15 D; and/orthe range of maximum powers of the set of ophthalmic lenses is greater than or equal to 16 D; and/orthe range of maximum powers of the set of ophthalmic lenses is greater than or equal to 24 D; and/orthe lower limit of the range of maximum powers of the set of ophthalmic lenses is greater than or equal to −10 D and the upper limit of the range of maximum powers of the set of ophthalmic lenses is smaller than or equal to +2 D; and/oreach of the ophthalmic lenses of the set of ophthalmic is a single vision ophthalmic lens; and/oreach of the ophthalmic lenses of the set of ophthalmic is adapted for the prescription of a wearer; and/orthe optical performance criterion relates to unwanted astigmatism; and/orthe optical performance criterion relates to an acuity drop; and/orthe optical performance criterion relates to power error; and/oreach semi-finished lens blank has a convex finished surface; and/oreach semi-finished lens blank has an unfinished rear surface; and/orthe base curve of each semi-finished lens blank is smaller than or equal to 2.5 D; and/oreach semi-finished lens blank has a flat finished surface; and/orthe finished surface of each semi-finished lens blank is non spherical; and/orthe finished surface of each semi-finished lens blank is rotationally symmetrical; and/orthe finished surface of each semi-finished lens blank has two axes of symmetry; and/orthe finished surface of each semi-finished lens blank has no rotational symmetry; and/orthe finished surface of each semi-finished lens blank is spherical; and/orevery semi-finished lens blank of the set of semi-finished blank has the same refractive index; and/orevery semi-finished lens blank of the set of semi-finished blank are identical; and/oreach ophthalmic lens of the set of ophthalmic lenses is manufactured with the same manufacturing process.

The invention further relates to a method, for example implemented by computer means, for determining a set of ophthalmic lenses that can be manufactured from a semi-finished lens blank, the method comprising:a semi-finished lens blank data providing step, during which semi-finished lens blank data representative of at least the base curve of the semi-finished lens blank is provided,an optical performance criterion providing step, during which at least one optical performance criterion is provided,an ophthalmic lenses set determining step, during which the set of ophthalmic lenses that:can be manufactured from a semi-finished lens blank corresponding to the semi-finished lens blank data,has the largest range of maximum power at a point of optical reference of the ophthalmic lenses, andmeets the optical performance criterion, is determined.

According to a further aspect, the invention relates to a computer program product comprising one or more stored sequence of instruction that is accessible to a processor and which, when executed by the processor, causes the processor to carry out the steps of the methods according to the invention.

According to another aspect the invention relates to a program which makes a computer execute the method of the invention.

The invention also relates to a computer readable medium carrying one or more sequences of instructions of the computer program according to the invention.

The invention further relates to a computer-readable storage medium having a program recorded thereon; where the program makes the computer execute the method of the invention.

The invention relates to a device comprising a processor adapted to store one or more sequence of instructions and to carry out at least one of the steps of a method according to the invention.

The invention also relates to a method of ordering an ophthalmic lens adapted for a wearer from an ophthalmic lens provider, the method comprising:wearer data providing step during which wearer data comprising at least the prescription of the wearer are provided,a feasibility step during which the feasibility of an ophthalmic lens from a given semi-finished lens blank and corresponding to the wearer data is determined by checking that the ophthalmic lens is within the set of ophthalmic lenses determined by the method for determining a set of ophthalmic lenses according to the invention for said given semi-finished lens blank.

The method of ordering an ophthalmic lens may further comprise a feedback step during which a feedback providing an indication of the result of the feasibility step is sent.

