Support, apparatus and method for performing a reflection measurement on an eyeglass

Support adapted for performing reflection measurements on an ophthalmic eyeglass, comprising:

• an upper part (4), comprising an upper base element (40) and three first contact portions (41-43) arranged rigidly on a lower end of the upper base element so as to produce respectively three first point-contacts with a first face (5a) of the eyeglass (5) at respective reference locations which are fixedly defined with respect to the upper part;
• a lower part (6), comprising a lower base element (60) and three second contact portions (61-63) each mounted on the lower base element so as to extend from an upper end of said lower base element up to respective variable distances beyond said upper end of the lower base element, and capable of providing three second point-contacts;
• and
• means for retaining the upper (4) and the lower (6) parts with the respective lower and upper ends facing one another, while pressing the second contact portions (61-63) towards the upper part so that the eyeglass (5) is held between the first contact portions (41-43) and said second contact portions, with the three second point-contacts located in a second face (5b) of the eyeglass opposed to the first face (5a);
• the upper base element (40) having recesses (44, 45) provided in opposed side faces of said upper base element, so that a light beam propagating in one of the recesses impinges on the first face (5a) of the eyeglass (5) at a measurement location situated between the three first point-contacts, and a reflection direction of the light beam from the measurement location in the eyeglass first face runs through the other one of the recesses and exits from said other recess.