Apparatus specifically adapted to and set up for changing the human perceptual color appearance of the iris of a human's or animal's eye by selectively decreasing the density of pigments of the anterior stroma layer of the iris, the apparatus comprising: an energy source (19, 20) comprising a generator module that is adapted and set up for generating a plurality of predefined energy quantities of at least one of electromagnetic type and mechanical wave type; a focusing device (19, 20) adapted to and set up for focusing the energy quantities towards the anterior stroma layer of the iris of the eye; a fluid pumping module adapted to and set up for the generation and maintenance of a predefined mechanical flow of rinsing solution through, and/or within the anterior eye chamber; and a controller unit that is programmed and set up for: - operating the energy source (19, 20) and focusing device (19, 20) to apply the generated, predefined energy quantities to a predefined location of the anterior layer of the stroma in such a way that melanocyte tissue of the stroma, that is impinged with the energy quantities is ablated in such a way that it is, at least in part, discharged into the anterior eye chamber as a direct cause of the interaction between the energy quantities and the tissue; and for - operating the fluid pumping module to maintain the predefined flow over a lapse of time during, and/or directly after applying the energy quantities to the stroma, such that discharged melanocyte material at least in part is fluidly discharged from the anterior chamber. an energy source (19, 20) comprising a generator module that is adapted and set up for generating a plurality of predefined energy quantities of at least one of electromagnetic type and mechanical wave type; a focusing device (19, 20) adapted to and set up for focusing the energy quantities towards the anterior stroma layer of the iris of the eye; a fluid pumping module adapted to and set up for the generation and maintenance of a predefined mechanical flow of rinsing solution through, and/or within the anterior eye chamber; and a controller unit that is programmed and set up for: - operating the energy source (19, 20) and focusing device (19, 20) to apply the generated, predefined energy quantities to a predefined location of the anterior layer of the stroma in such a way that melanocyte tissue of the stroma, that is impinged with the energy quantities is ablated in such a way that it is, at least in part, discharged into the anterior eye chamber as a direct cause of the interaction between the energy quantities and the tissue; and for - operating the fluid pumping module to maintain the predefined flow over a lapse of time during, and/or directly after applying the energy quantities to the stroma, such that discharged melanocyte material at least in part is fluidly discharged from the anterior chamber. - operating the energy source (19, 20) and focusing device (19, 20) to apply the generated, predefined energy quantities to a predefined location of the anterior layer of the stroma in such a way that melanocyte tissue of the stroma, that is impinged with the energy quantities is ablated in such a way that it is, at least in part, discharged into the anterior eye chamber as a direct cause of the interaction between the energy quantities and the tissue; and for - operating the fluid pumping module to maintain the predefined flow over a lapse of time during, and/or directly after applying the energy quantities to the stroma, such that discharged melanocyte material at least in part is fluidly discharged from the anterior chamber.