Intraocular lenses for presbyopia treatment

A method of designing an intraocular lens, the method comprising:

• defining a diffractive profile including:
• a central zone, a peripheral zone, and a middle zone positioned between the central zone and the peripheral zone,
• the central zone includes a first set of two echelettes arranged around an optical axis, the first set having a profile in r-squared space, the first set being disposed twice in series on the central zone to form a repeated first set,
• the middle zone includes a second set of two echelettes arranged around the optical axis, the second set being adjacent the repeated first set, the second set having a profile in r-squared space that is different than the profile of the first set, the second set occurring once on the middle zone and not being repeated on the middle zone, and
• the peripheral zone includes a third set of two echelettes arranged around the optical axis, the third set being adjacent the second set, the third set having a profile in r-squared space that is different than the profile of the first set and the profile of the second set, the third set being repeated in series at least once on the peripheral zone to form a repeated third set,
• wherein, for each of the first set, the second set, and the third set, the two echelettes are connected by a transition zone having a step height and a step offset from a base curve;
• and
• generating a diffractive lens surface based on the diffractive profile.