A computer-implemented method for creating a design of a prescription surface of a multifocal lens, in particular for a progressive lens, for the purpose of using the design for the manufacture of a multifocal lens, comprising the steps of: step S10: obtaining first data (m F) for describing at least one aberration of an eye of a subject for a first situation of use and second data (m N) for describing at least one aberration of the eye of the subject for a second situation of use (step S10); step S20: determining a first parameter set (( c uF, c vF, a F)) and a second parameter set (( c uN, c vN, a N)) of a predetermined recipe surface equation from the first and second data (m F, m N) the recipe surface equation being associated with the first parameter set with a first reference point (B F) of the recipe surface and being associated with the second parameter set with a second reference point (B N) of the recipe surface; and step S40: determination of recipe area values ( z ( u, v)) of the recipe area at the first reference point (B F) using the first parameter set (( c uF, c vF, a F)) at the second reference point (B N) using the second parameter set (( c uN, c vN, a N)), characterised in that the method further comprises a step S30 of calculating, by means of interpolation or extrapolation, further parameter sets (( c u, c v, a)) of the recipe surface equation at further coordinates (( u, v)) of the recipe surface from the first parameter set (( c uF, c vF, a F) and the second parameter set (( c uN, c vN, a N)); and in step S40, recipe surface values ( z ( u, v)) of the recipe surface are also determined at further coordinates (( u, v)) of the recipe surface using the further parameter sets (( c u, c v, a)). step S10: obtaining first data (m F) for describing at least one aberration of an eye of a subject for a first situation of use and second data (m N) for describing at least one aberration of the eye of the subject for a second situation of use (step S10); step S20: determining a first parameter set (( c uF, c vF, a F)) and a second parameter set (( c uN, c vN, a N)) of a predetermined recipe surface equation from the first and second data (m F, m N) the recipe surface equation being associated with the first parameter set with a first reference point (B F) of the recipe surface and being associated with the second parameter set with a second reference point (B N) of the recipe surface; and step S40: determination of recipe area values ( z ( u, v)) of the recipe area at the first reference point (B F) using the first parameter set (( c uF, c vF, a F)) at the second reference point (B N) using the second parameter set (( c uN, c vN, a N)), characterised in that the method further comprises a step S30 of calculating, by means of interpolation or extrapolation, further parameter sets (( c u, c v, a)) of the recipe surface equation at further coordinates (( u, v)) of the recipe surface from the first parameter set (( c uF, c vF, a F) and the second parameter set (( c uN, c vN, a N)); and in step S40, recipe surface values ( z ( u, v)) of the recipe surface are also determined at further coordinates (( u, v)) of the recipe surface using the further parameter sets (( c u, c v, a)).