1. A method implemented by a computer system for optimizing a spectacle lens for a wearer, the method comprising: determining a set of individual parameters for the wearer, wherein the individual parameters comprise individual prescription data and/or individual user preference data; identifying a quality grade of a plurality of quality grades of the spectacle lens; adapting the set of individual parameters depending on the identified quality grade, wherein the adapting step comprises: establishing a measure of quality based on a deviation of the adapted set of individual parameters from the set of individual parameters determined for the wearer; and deriving the adapted set of individual parameters such that the measure of quality meets the identified quality grade; and calculating a surface of the spectacle lens based on the adapted set of individual parameters.