Multifocal lenses for pre-presbyopic individuals

A method for designing a lens, comprising the steps of:

• a.) designing a first surface that is a progressive addition surface P(x,y) using a base spherical surface Ps(x,y);
• b.) expressing the first surface P(x,y) as a plurality of sag values Po(x,y);
• c.) altering locally one or more of the plurality of sag values Po(x,y) to provide a second surface N(x,y);
• d.) adding the second surface N(x,y) to the base spherical surface Ps(x,y) to obtain a non-conic aspheric surface comprising an add power and having a maximum unwanted astigmatism between about 50% and 60% of the non-conic surface's add power.