Method for determining a parameter of an optical equipment

A method for determining a parameter of an optical equipment including at least one optical lens including at least one permanent marking and being mounted in a spectacle frame, the method comprising:

• positioning optical equipment before a pattern in a first position;
• positioning a portable electronic device comprising an image acquisition module in a second position to acquire an image showing together the pattern seen through at least part of the at least one optical lens of the optical equipment in the first position and at least part of the spectacle frame of the optical equipment in the first position, the portable electronic device comprising a display, the pattern being generated by the display;
• detecting the at least one permanent marking on the at least one optical lens by using the image acquired by the image acquisition module of the portable electronic device in the second position;
• and
• determining at least one parameter of the optical equipment based on the position of the permanent marking,
• wherein the optical axis of the image acquisition module and the normal to the display going through the center of the display are parallel to one another but not coinciding so that the pattern goes through the at least one optical lens, is reflected on a mirror located substantially parallel to the plane of a front of the at least one optical lens, goes through the at least one optical lens again and is then detected by the image acquisition module of the portable electronic device.