Lens mounting structures for head-mounted display systems

A head-mounted device, comprising:

• a display system configured to produce a display image, wherein the display system includes a waveguide with an output coupler;
• a head-mounted support structure comprising a mating recess;
• a front-mounted front lens attached to the head-mounted support structure, wherein the front-mounted front lens includes an optical element that has a protrusion configured to engage the mating recess;
• adhesive between the protrusion and the mating recess;
• and
• a rear-mounted rear lens attached to the head-mounted support structure, wherein the waveguide is located between the rear-mounted rear lens and the front-mounted front lens and is separated from the front-mounted front lens and rear-mounted rear lens by respective first and second air gaps.

A head-mounted device, comprising:

• a display system configured to produce a display image, wherein the display system includes a waveguide with an output coupler;
• a head-mounted support structure comprising a front shelf that forms a front-facing surface that faces a first direction and a rear shelf that forms a rear-facing surface that faces a second direction that is opposite the first direction;
• a front-mounted front lens attached to the front shelf of the head-mounted support structure with adhesive;
• and
• a front-mounted rear lens attached to the rear shelf of the head-mounted support structure with adhesive, wherein the waveguide is located between the front-mounted rear lens and the front-mounted front lens and is separated from the front-mounted front lens and front-mounted rear lens by respective first and second air gaps.