A method for monitoring a visual capacity modification parameter of a user of a plurality of display devices, the visual capacity modification parameter being indicative of the modification of a parameter linked to the visual capacity of the user related to the use of the plurality of display devices, the method comprises: - a display use data determining step during which display use data indicative of a use of each display device of the plurality of display devices by the user are determined, - a visual capacity modification parameter determining step during which a modification parameter of the visual capacity of the user is determined based on said display use data, - an information generating step during which an information based on said modification parameter of the visual capacity of the user is generated, - a display device data providing step during which display device data indicative of each display device of the plurality of the display devices used by the user are provided, and wherein the visual capacity modification parameter is determined based on said display device data and on each determined display use data indicative of a use of each display device by the user, wherein the information generating step comprises a recommendation data providing step during which recommendation data based at least on the determined visual capacity modification parameter is generated, wherein in the information generating step, a notification message is generated and displayed on the screen of at least one of the display devices to alert the user if a risk of deterioration of the visual capacity of the user is considered to exist, wherein display use data indicative of a use of the at least one display device by the user comprises the time spent to watch the at least one display devices, and wherein continuous watching of one of the display devices is more than 20 min. - a display use data determining step during which display use data indicative of a use of each display device of the plurality of display devices by the user are determined, - a visual capacity modification parameter determining step during which a modification parameter of the visual capacity of the user is determined based on said display use data, - an information generating step during which an information based on said modification parameter of the visual capacity of the user is generated, - a display device data providing step during which display device data indicative of each display device of the plurality of the display devices used by the user are provided, and wherein the visual capacity modification parameter is determined based on said display device data and on each determined display use data indicative of a use of each display device by the user, wherein the information generating step comprises a recommendation data providing step during which recommendation data based at least on the determined visual capacity modification parameter is generated, wherein in the information generating step, a notification message is generated and displayed on the screen of at least one of the display devices to alert the user if a risk of deterioration of the visual capacity of the user is considered to exist, wherein display use data indicative of a use of the at least one display device by the user comprises the time spent to watch the at least one display devices, and wherein continuous watching of one of the display devices is more than 20 min.