Electrically-controlled optical device with a front shell

1. An electrically-controlled optical device to be placed in front of a user's eye, the electrically-controlled optical device being an ophthalmic device, the electrically-controlled optical device comprising:

a front shell defining a front surface and a back surface opposed to the front surface, the front shell comprising a slab, at least one functional layer arranged on the back surface and one primer layer, said primer layer being arranged between the at least one functional layer and the slab; and

an electrically-controlled object facing the back surface of the front shell,

wherein the primer layer is conformed such that the electrically-controlled optical device is mechanically resistant to an impact energy of at least 200 mJ, and

wherein the primer layer is configured to form a refractive index adaptive layer.

2. The electrically-controlled optical device according to claim 1 , wherein the slab is made of mineral material.

3. The electrically-controlled optical device according to claim 1 , wherein the front shell is less than 1.7 mm thick.

4. The electrically-controlled optical device according to claim 1 , wherein the primer layer has a thickness less than 4 μm.

5. The electrically-controlled optical device according to claim 1 , wherein the primer layer is resistant to a temperature of at least 100° C.

6. The electrically-controlled optical device according to claim 1 , further comprising a back shell facing the front shell, the back shell being arranged such that the electrically-controlled object is located between the back shell and the front shell, and wherein the at least one functional layer comprises a transparent conductive layer.

7. The electrically-controlled optical device according to claim 6 , further comprising an element placed in electrical contact with the transparent conductive layer, the element being selected from the group consisting of a liquid crystals layer, an electrochromic material layer.

8. The electrically-controlled optical device according to claim 1 , wherein the back surface of the front shell is concave.

9. The electrically-controlled optical device according to claim 1 , wherein the electrically-controlled optical device has a transmittance function to actively protect against glare.

10. The electrically-controlled optical device according to claim 1 , wherein the primer layer has a thickness less than 3 μm.

11. The electrically-controlled optical device according to claim 1 , wherein the primer layer has a thickness less than 2 μm.

12. The electrically-controlled optical device according to claim 1 , wherein the primer layer is made of a polymer or a sol-gel material or a composite organic/inorganic material.

13. A method for manufacturing a front shell of an electrically-controlled optical device to be placed before a user's eye and having a primer layer conformed such that the electrically-controlled optical device is mechanically resistant to an impact energy of at least 200 mJ, the primer layer being made of a polymer or a sol-gel material or a composite organic/inorganic material, the method comprising:

providing a slab having a front surface and a back surface;

depositing the primer layer on at least the back surface of the slab;

curing the primer layer deposited on the slab at a curing temperature; and

applying at least one functional layer on the primer layer so that the at least one functional layer is arranged on at least the back surface of the front shell, the primer lave being configured to form a refractive index adaptative layer.

14. The method according to claim 13 , wherein the at least one functional layer is applied through a sputtering method at a predetermined sputtering temperature.

15. The method according to claim 14 , wherein the predetermined sputtering temperature is at least 100° C.