Method for providing a spectacle ophthalmic lens by calculating or selecting a design

A method for manufacturing a spectacle ophthalmic lens for a wearer, the method comprising the following steps:

• aa) providing a value, SV, representing a sensitivity of the wearer referred to a scale of sensitivity to perception of spatial orientation, according to visual and non visual frames of reference;
• bb) calculating a design of the spectacle ophthalmic lens or selecting a design in a spectacle ophthalmic lens design data base by adapting the management of residual astigmatism and/or optical power reparation according to gaze direction based on the value, SV, representing the sensitivity of the wearer referred to a scale of sensitivity to perception of spatial orientation;
• cc) providing a lens substrate;
• dd) manufacturing the spectacle ophthalmic lens according to the optical system (OS) corresponding to the calculated or selected design in step bb),
• wherein providing the value, SV, representing the sensitivity of the wearer referred to a scale of sensitivity to perception of spatial orientation comprises measuring the perception of spatial orientation of the wearer comprises:
• a1) measuring the value of a parameter representative of the perception of spatial orientation when the wearer's body is arranged according to a first non visual frame of reference;
• a2) modifying the first non visual frame of reference and thus providing a second non visual frame of reference and measuring the value of the parameter representative of the perception of spatial orientation;
• b1) measuring the value of the parameter representative of the perception of spatial orientation when the wearer's eyes are provided with a first visual frame of reference;
• b2) modifying the first visual frame of reference so as to provide a second visual frame of reference and measuring the value of the parameter representative of the perception of spatial orientation;
• and
• c) combining the measured values of the parameters representative of the perception of spatial orientation of steps a1), a2), b1), b2) so as to obtain the value, SV, representing the sensitivity of the wearer referred to a scale of sensitivity to perception of spatial orientation.