A method of monitoring the visual behavior of a cohort group of members, comprising: - a cohort group visual behavior monitoring step during which the visual behavior of the members of the cohort group of members is monitored so as to provide visual behavior data over time at least by means of at least one sensor adapted and configured to sense such visual behavior data, wherein the visual behavior provides indication relating to the gazing behavior of each member, such as gazing direction, gazing distances, or variation of gazing distances, wherein the at least one sensor is adapted to sense the intensity and/or wavelength and/or direction of electromagnetic radiations, in particular of light radiation in the environment of the cohort group, - a visual behavior deviation detection step during which a visual behavior deviation of at least one member of the cohort group relative to the visual behavior of the other members of the group and/or relative to the model visual behavior of the at least one member of the cohort group is detected through use of statistical analysis to evaluate the visual behavior data of each member of the cohort provided over time, and - a vision information generating step during which vision information relating to the vision of the at least one member of the cohort group is generated based on the behavior deviation of the at least one member of the cohort group, wherein the vision information relates to a recommendation for the at least one member of the cohort group and the recommendation comprises a lens design recommendation, and wherein the vision information comprises an activation of at least a filtering functionality on a head-mounted device provided to the at least one member of the cohort group; and wherein the vision information comprises adjusting a dioptric function of the head mounted device. - a cohort group visual behavior monitoring step during which the visual behavior of the members of the cohort group of members is monitored so as to provide visual behavior data over time at least by means of at least one sensor adapted and configured to sense such visual behavior data, wherein the visual behavior provides indication relating to the gazing behavior of each member, such as gazing direction, gazing distances, or variation of gazing distances, wherein the at least one sensor is adapted to sense the intensity and/or wavelength and/or direction of electromagnetic radiations, in particular of light radiation in the environment of the cohort group, - a visual behavior deviation detection step during which a visual behavior deviation of at least one member of the cohort group relative to the visual behavior of the other members of the group and/or relative to the model visual behavior of the at least one member of the cohort group is detected through use of statistical analysis to evaluate the visual behavior data of each member of the cohort provided over time, and - a vision information generating step during which vision information relating to the vision of the at least one member of the cohort group is generated based on the behavior deviation of the at least one member of the cohort group, wherein the vision information relates to a recommendation for the at least one member of the cohort group and the recommendation comprises a lens design recommendation, and wherein the vision information comprises an activation of at least a filtering functionality on a head-mounted device provided to the at least one member of the cohort group; and wherein the vision information comprises adjusting a dioptric function of the head mounted device. <EOS>