Fresnel lens with dynamic pitch

A method, comprising:

• transmitting light from an electronic display toward a lens comprising an optically transparent substrate having a first lens surface and a second lens surface opposite to the first lens surface, wherein:
• the lens is configured for directing the light from the electronic display toward a first reference pupil through a first medium;
• the first lens surface includes a plurality of Fresnel structures, wherein a respective Fresnel structure of the plurality of Fresnel structures is characterized by a representative pitch;
• the representative pitch of the respective Fresnel structure is based on a distance of the respective Fresnel structure from a reference axis of the lens;
• the respective Fresnel structure of the plurality of Fresnel structures includes a slope facet and a draft facet;
• 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 the center of the first reference pupil;
• 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 respective Fresnel structure and propagates toward the center of the first 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.