I am trying to design a trifocal lens by making changes to the 'intraocular lens model'. What I want to do is to obtain a phase that starts with a value other than 0 by making changes to the phase profile. What I don't understand here is, can you give me information about the values I will enter into the binary 2 parameters? What does normradius and maximum term value change? Can I change the phase profile as I want? If it is not possible to do this with binary2, is there another surface type you can recommend?