Eyeglass devices and related methods
Eyeglass devices may include a frame shaped and sized to be worn by a user at least partially in front of the user's eyes, a varifocal optical element mounted to the frame, and an eye-tracking element mounted to the frame. The varifocal optical element may include a substantially transparent actuator positioned at least partially within an optical aperture of the varifocal optical element and configured to alter a shape of the varifocal optical element upon actuation. The eye-tracking element may be configured to track at least a gaze direction of the user's eyes, and the varifocal optical element may be configured to change, based on information from the eye-tracking element, in at least one optical property including a focal distance. Various other devices, systems, and methods are also disclosed.
1. An eyeglass device, comprising:
a frame shaped and sized to be worn by a user at least partially in front of the user's eyes;
a varifocal optical element mounted to the frame to be in a position in front of the user's eyes when the eyeglass device is worn by the user, wherein the varifocal optical element comprises a substantially transparent actuator positioned at least partially within an optical aperture of the varifocal optical element and configured to alter a shape of the varifocal optical element upon actuation;
an eye-tracking element mounted to the frame, wherein:
the eye-tracking element is configured to track at least a gaze direction of the user's eyes, and
the varifocal optical element is configured to change, based on information from the eye-tracking element, in at least one optical property including a focal distance; and
a manual input configured for the user to deactivate automatic changing of the at least one optical property by the varifocal optical element.
2. The eyeglass device of claim 1 , wherein the varifocal optical element comprises:
a substantially transparent support element;
the substantially transparent actuator coupled to the support element at least along a periphery of the actuator; and
a substantially transparent deformable medium disposed between the support element and the actuator.
3. The eyeglass device of claim 1 , wherein the actuator comprises a substantially transparent electroactive polymer.
4. The eyeglass device of claim 3 , wherein the actuator further comprises at least one substantially transparent electrode coupled to the electroactive polymer.
5. The eyeglass device of claim 1 , further comprising a depth-sensing element mounted to the frame, wherein:
the depth-sensing element is configured to determine a distance from the frame to objects and surfaces in front of the user, and
the varifocal optical element is configured to change in the at least one optical property further based on information from the depth-sensing element.
6. The eyeglass device of claim 5 , wherein the depth-sensing element comprises a time-of-flight sensor configured to emit light and detect the emitted light after reflecting from the objects and surfaces and to measure the time-of-flight of the light from emission to detection.
7. The eyeglass device of claim 5 , wherein the depth-sensing element comprises a structured light sensor including an emitter that projects structured light and an image sensor that detects the projected structured light after reflecting from the objects and surfaces and to determine the depth of the objects and surfaces by analyzing changes in the reflected structured light.
8. The eyeglass device of claim 1 , wherein the eye-tracking element is further configured to estimate a vergence angle and gaze depth of the user's eyes.
9. The eyeglass device of claim 1 , further comprising an optical lens mounted to the frame such that the user can view the world through at least the optical lens and the varifocal optical element.
10. The eyeglass device of claim 9 , wherein the optical lens comprises a prescription lens.
11. The eyeglass device of claim 1 , wherein the eye-tracking element is positioned at least partially within the optical aperture of the varifocal optical element.
12. The eyeglass device of claim 1 , wherein the varifocal optical element is configured to further change in the at least one optical property based on a passage of a predetermined time.
13. The eyeglass device of claim 12 , wherein the predetermined time is less than a day.
14. A method of forming an eyeglass device, the method comprising:
mounting a varifocal optical element to an eyeglass frame to be in a position in front of a user's eye when the eyeglass device is worn by the user, wherein the varifocal optical element comprises a substantially transparent actuator positioned at least partially within an optical aperture of the varifocal optical element and is configured to change in at least one optical property including a focal distance based, at least in part, on a passage of a predetermined time; and
mounting an eye-tracking element to the eyeglass frame, wherein the eye-tracking element is configured to track at least a gaze direction of the user's eye, wherein the varifocal optical element is configured to change in the at least one optical property based on information from the eye-tracking element.
15. The method of claim 14 , further comprising mounting a depth-sensing element to the eyeglass frame, wherein:
the depth-sensing element is configured to determine a distance from the frame to objects and surfaces in front of the user, and
the varifocal optical element is configured to change in the at least one optical property further based on information from the depth-sensing element.
16. The method of claim 14 , wherein mounting the eye-tracking element to the eyeglass frame comprises positioning at least a portion of the eye-tracking element within an optical aperture of the eyeglass frame.
17. A method of operating an eyeglass device, the method comprising:
tracking, with an eye-tracking element mounted to an eyeglass frame, at least a gaze direction of a user's eyes;
determining, based at least in part on the tracked gaze direction, a distance at which the user's eyes are fixated;
changing, based on the tracked gaze direction and the determined distance, at least one optical property of a varifocal optical element mounted to the eyeglass frame, wherein:
the at least one optical property includes a focal distance; and
the varifocal optical element comprises a substantially transparent actuator positioned at least partially within an optical aperture of the varifocal optical element and configured to alter a shape of the varifocal optical element upon actuation; and
changing, with the varifocal optical element, a baseline optical power of the varifocal optical element after a predetermined time.
18. The method of claim 17 , further comprising adjusting a transition rate of the changing of the at least one optical property of the varifocal optical element.