Disclosed herein, inter alia, are a method, system and a kit for improving a defined condition in a subject, the method comprising selecting a set of one or more correction zones, being surface zones on the surface of the subject's skin or defined angular zones in the subject's field of view, the one or more correction zones being associated with the condition； and placing the one or more correcting elements in said one or more correction zones to thereby cause improvement in said condition. Also provided herein are methods and systems for providing such correction zones related to a defined condition in a subject or to a defined cause in a subject being associated with a defined condition.
