Content interaction driven by eye metrics

1. A head mounted display system for displaying image content to a user, the display system comprising:

at least one display configured to be worn by a user to present virtual content to first and second eyes of a user;

a first inward facing camera configured to image the first eye of the user;

a second inward facing camera configured to image the second eye of the user; and

processing electronics in communication with the first and second inward-facing cameras and the at least one display, the processing electronics configured to:

present virtual content to the user on the at least one display;

using the first inward-facing camera, determine that the first eye is at least partially closed;

using the second inward-facing camera, determine that the second eye is at least partially closed;

determine a gaze direction of the first and second eyes;

determine a vergence of the first and second eyes; and

based on (i) the determination that the first and second eyes of the user are at least partially closed, (ii) the gaze direction of the first and second eyes, and (iii) the vergence of the first and second eyes, alter a state of the head mounted display system so as to modify the virtual content presented to the user, a manner in which virtual content is presented to the user, a performance feature of the head mounted display system apparent to the user, or any combination thereof.

2. The display system of claim 1 , wherein the processing electronics are configured to alter said state of the head mounted display system based on a determination that the first and second eyes of the user are at least partially closed for longer than a threshold time.

3. The display system of claim 2 , wherein said threshold time is in the range from 500 milliseconds to 1.5 seconds.

4. The display system of claim 2 , wherein said threshold time in the range from 750 milliseconds to 2.0 seconds.

5. The display system of claim 2 , wherein said threshold time in the range from 1 second and 3 seconds.

6. The display system of claim 2 , wherein said threshold time in the range from 3 second and 10 seconds.

7. The display system of claim 1 , wherein the processing electronics are configured to alter said state of the head mounted display system based on a determination that the first and second eyes of the user transition from being in an opened state to being in an at least partially closed state at least a first time and a second time.

8. The display system of claim 7 , wherein said first and second times are separated by less than 3 seconds.

9. The display system of claim 7 , wherein said first and second times are separated by less than 2 seconds.

10. The display system of claim 7 , wherein said first and second times are separated by less than 1.5 seconds.

11. The display system of claim 1 , wherein the processing electronics are configured to alter said state of the head mounted display system based on a determination that the first and second eyes of the user transition from being in an opened state to being in an at least partially closed state at least three times, a first time, a second time, and a third time.

12. The display system of claim 11 , wherein said first and second times as well as said second and third times are separated by less than 3 seconds.

13. The display system of claim 11 , wherein said first and second times as well as said second and third times are separated by less than 2 seconds.

14. The display system of claim 11 , wherein said first and second times as well as said second and third times are separated by less than 1.5 seconds.

15. The display system of claim 1 , wherein the processing electronics are configured to display buttons, knobs, windows, menu items, or other regions toward which the user can direct their gaze to make a selection, the processing electronics being configured to identify the gaze direction of the first and second eyes and to use the gaze direction directed at the buttons, knobs, windows, menu items, or other regions and the determination that the first and second eyes of the user are at least partially closed in identifying a command or selection to alter the state of the head mounted display system so as to modify the virtual content presented to the user, the manner in which virtual content is presented to the user, a performance feature of the head mounted display system apparent to the user, or any combination thereof.

16. The display system of claim 1 , wherein the processing electronics are configured to display buttons, knobs, windows, menu items, or other regions toward which the user can direct their gaze to make a selection, the processing electronics being configured to identify the gaze direction and the vergence of said first and second eyes and to use the gaze direction and vergence directed at said buttons, knobs, windows, menu items, or other regions and said determination that the first and second eyes of the user are at least partially closed in identifying a command or selection to alter the state of the head mounted display system so as to modify the virtual content presented to the user, the manner in which virtual content is presented to the user, a performance feature of the head mounted display system apparent to the user, or any combination thereof.

17. The display system of claim 1 , wherein the processing electronics are configured to display buttons, knobs, windows, menu items, or other regions toward which the user can direct their gaze to make a selection, the processing electronics being configured to identify the vergence of said first and second eyes and to use the vergence directed at the buttons, knobs, windows, menu items, or other regions and the determination that the first and second eyes of the user are at least partially closed in identifying a command or selection to alter the state of the head mounted display system so as to modify the virtual content presented to the user, the manner in which virtual content is presented to the user, a performance feature of the head mounted display system apparent to the user, or any combination thereof.

18. The display system of 1 , wherein altering the manner in which virtual content is presented to the user comprises modifying the color of virtual content presented to the user, the color palette used to provide color to the virtual content, the position of the virtual content, or movement of the virtual content.