Patent ID: 8142017

Claim:
Method of producing an ophthalmic eyeglass for a pair of spectacles intended for an identified wearer, said eyeglass having an anterior face (S ANT ) and a posterior face (S POST ) each capable to have an addition, said method comprising the following steps: /1/ obtaining an optical power addition value for the eyeglass, between a far vision point (VL) and a near vision point (VP) of said eyeglass, prescribed for the wearer; and /2/ characterising relative amplitudes of respective eye and head movements of the wearer, performed during a change in sight direction of said wearer; and being characterized in that it also comprises the following steps: /3/ determining a characteristic that varies according to a distribution of the addition of the eyeglass between the anterior (S ANT ) and posterior (S POST ) faces, and is felt differently by the wearer depending on whether he is turning rather his head or his eyes when changing the sight direction; /4/ depending to the relative amplitudes of the respective eye and head movements of the wearer characterised at step /2/, selecting addition values that are intended respectively for the anterior face (S ANT ) and the posterior face (S POST ) of the eyeglass, said addition values of the two faces being adapted so that the eyeglass has substantially the prescribed addition value, and so that the characteristic that is determined at step /3/ is adapted to the wearer; and /5/ manufacturing the eyeglass with the anterior (S ANT ) and posterior (S POST ) faces that have the addition values selected at step /4/ for each of said faces.