The invention relates to a method, computer-implemented, for determining an optical parameter of a progressive addition lens (3) to be worn by a wearer, the progressive addition lens having an optical parameter relating to vision correction, the wearer being equipped with a
hearing aid device (2) adapted to acquire, amplify and transmit sounds to the wearer, the
hearing aid device having a sensitivity which is maximum along a main direction (D1), the method comprising: - determining a behavior parameter representative of a head response of the wearer, when he is equipped with the
hearing aid device, to an auditive stimulation spatially offset from the main direction, - determining, based on the behavior parameter, the optical parameter of the progressive addition lens.