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1. (WO2017149335) METHOD OF DETERMINING A REFRACTIVE POWER VALUE CHARACTERISING AN OPHTHALMIC LENS AND CORRESPONDING ELECTRONIC DEVICE
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CLAIMS

1 . A method of determining a refractive power value characterising an ophthalmic lens (L) for correction of an individual's eye ametropia, comprising the following steps:

- obtaining first data representative of a refraction value and second data

(Di , D2) representative of a position of the individual's head with respect to a refraction apparatus when said refraction value was determined;

- determining said refractive power value as a function of said first data and of a relative position, derived from said second data (Di , D2), of the refraction apparatus with respect to a centre of rotation (O) of said eye when said refraction value was determined.

2. The method according to claim 1 , wherein said relative position is determined by considering the position of the refraction apparatus when the refraction value was determined and the centre of rotation (O) in a common three-dimensional frame of reference.

3. The method according to claim 1 or 2, wherein said value is determined such that a refractive power provided by the lens (L) to the individual when said lens is worn before the individual's eye corresponds to a refractive power provided by the refraction apparatus to the individual when said refraction value was determined.

4. The method according to any of claims 1 to 3, wherein said value is also determined as a function of third data (D'i , D'2, T) representative of a position, with respect to the individual's head (H), of a frame (F) designed to carry said ophthalmic lens (L).

5. The method according to claim 4, wherein said third data includes a distance (ϋΊ, D'2) between the individual's eye (E) and the ophthalmic lens (L) when carried by the frame (F).

6. The method according to claim 4 or 5, wherein said third data includes a tilt angle (T) of said frame (F).

7. The method according to any of claims 4-6, wherein said third includes a face form angle of said frame.

8. The method according to any of claims 1 -7, wherein said second data includes a distance (Di, D2) between the individual's eye and the refraction apparatus.

9. The method according to any of claims 1 -8, wherein said second data includes a yaw angle of the individual's head with respect to the refraction apparatus.

10. The method according to any of claims 1 -9, wherein said second data includes a roll angle of the individual's head with respect to the refraction apparatus.

1 1 . The method according to any of claims 1 -7, wherein said second data includes three coordinates defining the location of the individual's head with respect to the refraction apparatus and three angles defining the orientation of the individual's head with respect to the refraction apparatus.

12. The method according to any of claims 1 -1 1 , further comprising a step of designing an ophthalmic lens such that the designed ophthalmic lens has the determined refractive power value.

13. The method according to any of claims 1 -1 1 , further comprising a step of manufacturing an ophthalmic lens having the determined refractive power value.

14. The method according to any of claims 1 -1 1 , further comprising a step of selecting an ophthalmic lens having a refractive power value close to the determined value.

15. The method according to any of claims 1 -1 1 , wherein the step of determining the refractive power value comprises a sub-step of determining a modified refraction value based on said first data and said relative position, and wherein the method comprises a step of ordering an ophthalmic lens specifying the modified refraction value and data representative of a position, with respect to the individual's head, of a frame designed to carry said ophthalmic lens.

16. The method according to any of claims 1 -1 1 , comprising a step of ordering an ophthalmic lens specifying said first data, said relative position and data representative of a position, with respect to the individual's head, of a frame designed to carry said ophthalmic lens.

17. The method according to any of claims 1 -1 1 , further comprising a step (S10) of ordering an ophthalmic lens specifying a lens power to be measured on a lensmeter as determined based on said first data, said relative position and data representative of a position, with respect to the individual's head, of a frame designed to carry said ophthalmic lens.

18. An electronic device comprising:

- an input unit for obtaining first data representative of a refraction value and second data representative of a position of the individual's head with respect to a refraction apparatus when said refraction value was determined;

- a processing unit adapted to determine a refractive power value characterising an ophthalmic lens for correction of an individual's eye ametropia as a function of said first data and of a relative position, derived from said second data (Di , D2), of the refraction apparatus with respect to a centre of rotation (O) of said eye when said refraction value was determined.