Trifocal intraocular lens with extended range of vision and correction of longitudinal chromatic aberration

An intraocular lens, comprising:

• an anterior surface, a posterior surface and an optical axis, the lens being made of a material that has a refractive index;
• wherein at least one of the anterior or posterior surfaces has a diffractive profile formed thereon, the diffractive profile having:
• a diffractive focal point for far vision,
• a diffractive focal point for intermediate vision, and
• a diffractive focal point for near vision;
• wherein the diffractive profile corresponds to a superposition of a first partial diffractive profile and a second partial diffractive profile;
• the first partial diffractive profile has a focal point of order+n that coincides with either the diffractive focal point for intermediate vision or with the diffractive focal point for near vision;
• the second partial diffractive profile has:
• a focal point of order+n that coincides with the diffractive focal point for far vision,
• a focal point of higher order than +n that coincides with the diffractive focal point for near vision;
• wherein each of the first and second partial diffractive profiles has a plurality of steps with corresponding step heights;
• wherein in at least a portion of the diffractive profile, the step heights are selected such that n<a1+a2<n+1, wherein:
• a
• 1
• =
• h
• 1
• _
• /
• (
• λ
• 
• n
• 2
• -
• n
• 1
• 
• )
• ,
• ⁢
• a
• 2
• =
• h
• 2
• _
• /
• (
• λ
• 
• n
• 2
• -
• n
• 1
• 
• )
• ,
• h1 is the average of the step heights of the first partial diffractive profile in the portion of the diffractive profile,
• h2 is the average of the step heights of the second partial diffractive profile in the portion of the diffractive profile,
• λ=550 nm,
• n2 is the refractive index of the lens material,
• n1=1.3345, and
• n=1 or n=2.