Adaptive multifocal diffractive ocular lens

An ophthalmic multifocal lens, arranged to provide far, intermediate, and near vision, comprising a contact lens or an intraocular lens, said lens having a light transmissive lens body with an optical axis and a refractive baseline that extends over at least a part of the lens body, said lens further having a first portion that coincides with a central area of said light transmissive lens body, extending concentrically in a radial direction, and a multifocal second portion, extending concentrically in a radial direction, wherein

• said second portion of the ophthalmic multifocal lens further comprises a symmetric multifocal diffractive grating super positioned onto said refractive baseline, covering a portion of the lens, its shape and resulting light intensity distribution thereof changing with respect to its distance to the optical axis, said symmetric multifocal grating at least comprising one diffractive order contributing to far vision and one diffractive order contributing to near vision,
• a 0th order of said symmetric multifocal diffractive grating super positioned onto said refractive baseline substantially coincides with the power of the refractive baseline as well as an intended intermediate power of the lens,
• said first portion of said ophthalmic lens is configured so that super positioned onto said refractive baseline around the optical axis is a substantially concave shape, connected to the ridge of said symmetric multifocal diffractive grating that is closest to the optical axis,
• said refractive baseline provides a focal point substantially coinciding with the intermediate power, and;
• said first portion of said ophthalmic lens is configured to provide a dominant optical power that is in between the intended powers of far vision and intermediate vision,
• said ophthalmic multifocal lens is further configured such that;
• for an aperture of 5 millimeters, energy intended for near vision is weaker than energy intended for both intermediate and far vision respectively;
• for an aperture of 3 millimeters, intermediate energy is weaker than both the near and far energies respectively;
• and
• a ratio of energy intended for far vision to energy intended for near vision that is lower for an aperture of 3 mm compared to same ratio for apertures of 2 mm and 4.5 mm.