Intraocular lens

An intraocular lens, comprising:

• a lens body, at least one side surface of the lens body being provided with a focusing diffraction region comprised by a series of annular, concentric echelettes and a radially-adjacent shifting diffraction region comprised by a series of annular, concentric echelettes, wherein
• the focusing diffraction region comprises at least two types of focusing diffraction structures with different heights, and the focusing diffraction structures with different heights are arranged alternately to provide the intraocular lens with focuses corresponding to a far distance vision, a middle distance vision and a near distance vision respectively;
• the shifting diffraction region comprises shifting diffraction structures corresponding to the focusing diffraction structures;
• and
• wherein a height ratio of at least one type of the shifting diffraction structures to one corresponding type of the focusing diffraction structures ranges from 1.1 to 1.3, or from 0.80 to 0.95, the shifting diffraction structures are configured to provide a shift focus for the intraocular lens, the shift focus is located in a range between the focus corresponding to the far distance vision and the focus corresponding to the middle distance vision, and/or in a range between the focus corresponding to the middle distance vision and the focus corresponding to the near distance vision,
• wherein one type of the focusing diffraction structures is configured to provide a far distance visual focus corresponding to the far distance vision and/or a middle distance visual focus corresponding to the middle distance vision, and a height ratio of one corresponding type of the shifting diffraction structures to the focusing diffraction structure providing the far distance visual focus and/or the middle distance visual focus ranges from 1.1 to 1.3,
• wherein the shifting diffraction region is located at a periphery of the focusing diffraction region, an inner ring of the shifting diffraction region is connected to an outer ring of the focusing diffraction region, and the focusing diffraction region comprises a focusing diffraction structure through which an optical axis of the lens body passes and a focusing diffraction structure spaced apart from the optical axis,
• wherein the focusing diffraction structure spaced apart from the optical axis is provided with a first step surface facing the optical axis and a first diffraction surface facing away from the optical axis, one end of the first step surface of the focusing diffraction structure is configured to be connected to the first diffraction surface of the focusing diffraction structure, the other end is configured to be connected to a diffraction surface of an adjacent focusing diffraction structure or an adjacent shifting diffraction structure, there exists an abrupt change in the surface type at a connection between surfaces, the focusing diffraction structure through which the optical axis passes is provided with a first diffraction surface,
• wherein the at least two types of focusing diffraction structures with different heights comprise a first focusing diffraction echelette and a second focusing diffraction echelette,
• wherein the shifting diffraction structures comprises a first shifting diffraction echelette and a second shifting diffraction echelette;
• the first shifting diffraction echelette corresponds to the first focusing diffraction echelette;
• and
• the second shifting diffraction echelette corresponds to the second focusing diffraction echelette.