Patent ID: 8733931

Claim:
A method for determining binocular performance of a pair of spectacle lenses when a visual environment is seen by the right and left eyes of a wearer through right and left spectacle lenses respectively, comprising: an eyes characteristics providing step in which eyes characteristics data representing the characteristics of the right and left eyes of the wearer are provided; a pair of spectacle lenses providing step in which spectacle data representing the pair of spectacle lenses are provided; an environment providing step in which visual environment data representing a visual environment are provided; a cyclopean eye positioning step in which the cyclopean eye of the wearer is positioned; a binocular performance criteria defining step in which at least one binocular performance criterion which expresses the binocular performance of the pair of spectacle lenses for viewing an object point in the visual environment is defined according to the cyclopean eye; and a binocular performance criteria determining step in which the at least one binocular performance criterion is determined for a plurality of object points distributed in the visual environment, wherein the position of the cyclopean eye is customized according to the wearer, and wherein the binocular performance criteria determining step comprises: a cyclopean gaze direction sampling step in which the visual environment is sample based on a cyclopean gaze direction, an object point determining step in which for each cyclopean gaze direction a corresponding object point of the visual environment is determined, a left eye direction determining step in which for each of the object points determined during the object point determining step the left direction of a ray starting from the center of rotation of the left eye and focusing trough the left spectacle lens to the corresponding object point of the visual environment is determined, a right eye direction determining step in which for each of the object points determined during the object point determining step the right direction of a ray starting from the center of rotation of the right eye and focusing trough the right spectacle lens to the corresponding object point of the visual environment is determined, a left eye monocular performance criteria determining step in which for each of the directions determined during the left eye direction determining step at least one left monocular performance criterion for the left spectacle lens is determined, and a right eye monocular performance criteria determining step in which for each of the directions determined during the right eye direction determining step at least one right monocular performance criterion for the right spectacle lens is determined, wherein at least one binocular criterion is determined according to the at least one right and left monocular performance criterion.