Method of calculating an optical system according to a given spectacle frame
View Patent ↗A method of calculating an optical system (OS) of an ophthalmic lens according to a given spectacle frame comprising the steps of: providing geometrical data of the spectacle frame, providing deformability data of the spectacle frame, providing wearer data, providing a surface curvature of a front face of the ophthalmic lens, and optimization of both the optical system (OS) and the edging parameter according to the list of the optimization criteria consisting of the geometrical and deformability data of the spectacle frame and the wearer data, so as to generate at least one optical surface different from the front surface of the lens.
1. A method of calculating an optical system of an ophthalmic lens according to a given spectacle frame comprising the steps of:
providing geometrical data of the spectacle frame;
providing deformability data of the spectacle frame;
providing wearer data;
providing a surface curvature of a front face of the ophthalmic lens; and
optimization of both the optical system and edging parameter according to a list of optimization criteria consisting of the geometrical and deformability data of the spectacle frame and the wearer data, so as to generate at least one optical surface different from the front surface of the ophthalmic lens, wherein the geometrical data of the spectacle frame includes the curve C f of the front surface of a spectacle lens, the deformability data of the spectacle frame includes the deformability coefficient C d of the spectacle lens, the surface curvature of the face of the ophthalmic lens corresponds to a base curve C l , and the edging parameter includes at least a calculated bevel respecting: |C b −C f |≦C b , where C b is the curve of the bevel.
2. The method according to claim 1 , wherein during the optimization step edging parameters are generated.
3. The method according to claim 1 , wherein the bevel is calculated with respect to an edge of the spectacle lens according to a specified design mode and the curve of the bevel being:
C b =C f when | C l −C f |≦C d
C b =C f −C d when | C l −C f |>C d and C l −C f <0
C b =C f +C d when | C l −C f |>C d and C l −C f >0.
4. The method according to claim 1 , wherein before the optimization step the method further includes a step of providing an edging mode.
5. The method according to claim 1 , wherein the optimization criteria further comprises the index of refraction of the optical system.
6. The method according to claim 1 , wherein the geometrical data are obtained by measuring a spectacle frame.
7. The method according to claim 1 , wherein the geometrical data are obtained from a spectacle frame data base.
8. The method according to claim 1 , wherein the geometrical data comprise contour parameters and a reference shape.
9. The method according to claim 1 , wherein the geometrical data comprises an internal contour data of a rim of the spectacle frame.
10. The method according to claim 1 , wherein the ophthalmic lens is a multifocal ophthalmic lens.
11. The method according to claim 1 , wherein the ophthalmic lens is a monofocal ophthalmic lens.
12. The method according to claim 1 , wherein the optical system is identified by an optical function, at least two optical surfaces comprise a first optical surface defined by a first equation and a second surface defined by a second equation, the optimization step further comprises:
a generating step, in which a virtual optical system is used to generate a virtual function;
a modification step, in which the virtual function is modified so as to obtain the optical function; and
a calculation step, in which the second equation is calculated from the optical function, and the first equation.
13. A process in which a computer executes instructions set forth in a computer program, the computer program including instructions for executing the steps of the method of claim 1 .
14. A non-transitory computer readable medium storing a computer program executable on a processor which, when used on a computer apparatus causes the processor to execute the steps of the method of claim 1 .
15. An ophthalmic lens manufacturing method comprising the steps of:
receiving geometrical data of a spectacle frame, receiving an optical system of a ophthalmic lens data calculated using a method according to claim 1 , and
manufacturing the calculated ophthalmic lens.
16. The method according to claim 15 , wherein the spectacle frame is selected at a lens order side and the geometrical data are transmitted to a computing device installed at a lens manufacturer side where the calculation steps are processed.
17. The method according to claim 15 , wherein during the optimization step edging parameters are generated, and wherein the spectacle frame is selected at a lens order side and after being manufactured at a lens manufacturer side, the ophthalmic lens is transmitted to the order side with the edging parameters.
18. The method according to claim 15 , wherein the spectacle frame is selected at a lens order side and after being manufactured at a lens manufacturer side, the ophthalmic lens is edged and the edged ophthalmic lens is sent to the order side.
19. The method according to claim 15 , wherein the manufactured spectacle lens when edged is fitted in the selected spectacle frame.
20. An ophthalmic lens ordering method comprising the steps of:
selecting a spectacle frame,
ordering at a lens manufacturer an ophthalmic lens manufactured according to claim 15 ,
fitting the edged ophthalmic lens in the selected spectacle frame.
21. A process in which a computer executes instructions set forth in a computer program, the computer program including instructions for executing the steps of the method of claim 15 .
22. A non-transitory computer readable medium storing computer program executable on a processor which, when used on a computer apparatus causes the processor to execute the steps of the method of claim 15 .