Fresnel lens with dynamic draft for reduced optical artifacts

A method for reducing optical artifacts, comprising:

• transmitting light from an electronic display through a first medium toward a lens and transmitting the light through the lens toward a center of a reference pupil, the lens comprising an optically transparent substrate having a first lens surface and a second lens surface opposite to the first lens surface, wherein:
• the first lens surface includes a plurality of Fresnel structures, wherein a respective Fresnel structure of the plurality of Fresnel structures includes a slope facet and a draft facet, and the draft facet is characterized by a draft angle, relative to an optical axis of the lens, that is between a first angle for the respective Fresnel structure and a second angle for the respective Fresnel structure,
• the first angle for the respective Fresnel structure corresponding to an angle between the optical axis of the lens and a direction of a chief ray, in the first medium, incident upon the slope facet of the respective Fresnel structure, wherein the chief ray:
• is transmitted from a reference off-axis position on the electronic display, located away from an optical axis of the lens, and
• is transmitted through the slope facet of the respective Fresnel structure and propagates toward a center of a reference pupil;
• and
• the second angle for the respective Fresnel structure corresponding to an angle between the optical axis of the lens and a direction of the chief ray, in the optically transparent substrate, that is transmitted through the slope facet of the respective Fresnel structure and propagates toward the center of the reference pupil;
• the draft angle of the respective Fresnel structure is distinct from the first angle and the second angle for the respective Fresnel structure;
• and
• the draft angle of the respective Fresnel structure is a predefined weighted average of the first angle and the second angle.