12-09-2013 дата публикации
Номер: US20130235370A1
Method of determining at least one refractive characteristic of an ophthalmic lens, includes: 120. A method of determining at least one refractive characteristic of an ophthalmic lens () , the method comprising the steps of:{'b': 20', '10', '12', '13', '14', '20', '20, 'a) placing the lens () on a support () having at least one prop element (, , ) in contact with one of the main faces of the lens () in a contact zone of area that is small relative to the area of the main faces of said lens ();'}{'b': 20', '10', '40, 'b) lighting the lens () placed on its support () with the help of lighting means (); and'}{'b': 30', '12', '13', '14', '10', '1', '2', '20', '20, 'c) using image capture means () to capture an image of the prop element (, , ) of the support () lighted by light rays (R, R) that come from said lighting means and that have passed through the lens (), the image being captured in an image capture plane that is substantially perpendicular to an optical axis (AO) of the lens ();'}the method comprising the following steps:{'b': 12', '13', '14', '10, 'd) in said image, identifying the image of said prop element (, , ) of the support () and determining at least one characteristic representative of the geometry of the image of said prop element; and'}{'b': 12', '13', '14, 'e) from said characteristic representative of the geometry of the image of said prop element (, , ), deducing said looked-for refractive characteristic.'}24010. A method according to claim 1 , wherein the lighting means () are arranged on one side of said support () and:{'b': 12', '13', '14', '12', '13', '14', '10', '1', '2', '20', '30', '10', '40, 'in step c), an image is captured of the shadow (B, B, B) projected by the prop element (, , ) of the support () as lighted by the light rays (R, R) that come from said lighting means and that have passed through the lens (), the image being captured with the help of said image capture means () that are arranged on the side of said support () that is ...
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