Method for selecting progressive ophthalmic lenses

摘要

The disclosure relates to a method for selecting progressive ophthalmic lenses for a given frame and wearer, the progressive ophthalmic lenses having one area for distance vision and one area for near vision, said given frame having two recesses suitable for receiving a progressive ophthalmic lens, respectively, said two recesses defining a recess midplane. The method includes the following steps: a) fitting said wearer with said given frame; b) determining the position of a first point of intersection between a first direction of the gaze of said wearer in a distance vision posture and said recess midplane; c) determining the position of a second point of intersection between the gaze of said wearer in a near vision posture and said recess midplane; d) assessing the distance between said intersection points; and, e) selecting progressive ophthalmic lenses in which the progression length corresponds to said distance assessed between said intersection points.

主权项

1. A method for selecting progressive ophthalmic lenses for a given frame and a given wearer, wherein said progressive ophthalmic lenses exhibit a far vision zone and a near vision zone spaced apart by a progression length;
said given frame exhibiting two recesses configured respectively to receive a progressive ophthalmic lens, said two recesses defining a recess mid-plane; said frame is equipped with a calibrated rig exhibiting three tag points spaced apart respectively by a determined distance; said method comprising the following steps: a) said given wearer is fitted with said given frame; b) determining a position with respect to said frame of a first point of intersection of a first direction of gaze of said wearer in a far vision posture with said recess mid-plane; c) determining a position with respect to said frame of a second point of intersection of a second direction of gaze of said wearer in a near vision posture with said recess mid-plane; d) recording a second image of said frame equipped with said calibrated rig and the pupils of the eyes of said wearer along a direction neighboring said second direction of gaze, for determining said position of said second point of intersection with respect to said frame; e) evaluating a distance which extends between said points of intersection; f) providing progressive ophthalmic lenses whose progression length corresponds to said evaluated distance between said points of intersection; and g) providing a mobile support bearing inscriptions and a second camera secured to said mobile support and installed through said inscriptions, permitting said wearer fitted with said frame equipped with said calibrated rig to adjust said mobile support to a natural reading distance, so as to record said second image.