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 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 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 and focusing device 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 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 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 and focusing device 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 and focusing device 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 . <EOS>