Presbyopia may be treated by implanting a scleral prosthesis within a plurality of elongated pockets formed in the tissue of the sclera of the eye. The process employs one or more salts from a group of salts comprising sodium citrate, sodium acetate, sodium gluconate, ammonium sulfate, sodium chloride, sodium sulfate and ammonium chloride in two initial fractionation steps, followed by diafiltration to remove those salts employed. The invention applies in particular to domestic wireless communication networks. A data identifier is derived from program map data associating the data identifier and the User selection.