Monovision display for wearable device

1. An optical system comprising:

a left optical stack configured to output left virtual image light toward a user side of the optical system, the left optical stack having first and second left eyepieces associated with first and second focal planes, respectively;

a right optical stack configured to output right virtual image light toward the user side of the optical system, the right optical stack having first and second right eyepieces associated with the first and second focal planes, respectively, wherein each of the left optical stack and the right optical stack is configured to switch between displaying virtual content at the first focal plane or the second focal plane; and

a processing module configured to perform operations comprising:

determining whether or not an activation condition is satisfied, wherein the activation condition is determined to be satisfied by determining that eye tracking data is unavailable while a user is using the optical system; and

in response to determining that the activation condition is satisfied, activating a monovision display mode associated with the optical system, wherein activating the monovision display mode includes:

causing the left optical stack to display the virtual content solely at the first focal plane by outputting the left virtual image light at the first left eyepiece and-causing the right optical stack to display the virtual content solely at the second focal plane by outputting the right virtual image light at the second right eyepiece; or

causing the left optical stack to display the virtual content solely at the second focal plane by outputting the left virtual image light at the second left eyepiece and causing the right optical stack to display the virtual content solely at the first focal plane by outputting the right virtual image light at the first right eyepiece.

2. The optical system of claim 1 , wherein an optical power associated with the first focal plane and an optical power associated with the second focal plane differ by an offset amount.

3. The optical system of claim 2 , wherein the offset amount is greater than a threshold.

4. The optical system of claim 3 , wherein the threshold is one of 0.1 D, 0.2 D, 0.3 D, 0.4 D, 0.5 D, 0.6 D, 0.7 D, 0.8 D, 0.9 D, or 1.0 D.

5. The optical system of claim 1 , wherein determining whether the activation condition is satisfied includes:

determining whether or not the virtual content to be displayed is represented at both the first focal plane and the second focal plane; and

determining that the virtual content to be displayed is represented at both the first focal plane and the second focal plane.

6. The optical system of claim 1 , wherein the operations further comprise:

in response to determining that the activation condition is no longer satisfied, deactivating a monovision display mode.

7. The optical system of claim 1 , wherein the operations further comprise:

after a predetermined amount of time, modifying the monovision display mode.

8. A method comprising:

providing a wearable device including a left optical stack and a right optical stack, the left optical stack having first and second left eyepieces associated with first and second focal planes, respectively, and the right optical stack having first and second right eyepieces associated with the first and second focal planes, respectively, wherein each of the left optical stack and the right optical stack is configured to switch between displaying virtual content at the first focal plane or the second focal plane;

receiving the virtual content to be displayed at the left optical stack and the right optical stack;

determining whether or not an activation condition is satisfied, wherein the activation condition is determined to be satisfied by determining that eye tracking data is unavailable while a user is using the wearable device; and

in response to determining that the activation condition is satisfied, activating a monovision display mode associated with the wearable device, wherein activating the monovision display mode includes:

causing the left optical stack to display the virtual content solely at the first focal plane by outputting left virtual image light at the first left eyepiece and-causing the right optical stack to display the virtual content solely at the second focal plane by outputting right virtual image light at the second right eyepiece; or

causing the left optical stack to display the virtual content solely at the second focal plane by outputting the left virtual image light at the second left eyepiece and causing the right optical stack to display the virtual content solely at the first focal plane by outputting the right virtual image light at the first right eyepiece.

9. The method of claim 8 , wherein an optical power associated with the first focal plane and an optical power associated with the second focal plane differ by an offset amount.

10. The method of claim 9 , wherein the offset amount is greater than a threshold.

11. The method of claim 10 , wherein the threshold is one of 0.1 D, 0.2 D, 0.3 D, 0.4 D, 0.5 D, 0.6 D, 0.7 D, 0.8 D, 0.9 D, or 1.0 D.

12. The method of claim 8 , wherein determining whether the activation condition is satisfied includes:

determining whether or not the virtual content to be displayed is represented at both the first focal plane and the second focal plane; and

determining that the virtual content to be displayed is represented at both the first focal plane and the second focal plane.

13. The method of claim 8 , further comprising:

in response to determining that the activation condition is no longer satisfied, deactivating a monovision display mode.

14. The method of claim 8 , further comprising:

after a predetermined amount of time, modifying the monovision display mode.

15. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising:

receiving virtual content to be displayed at a left optical stack and a right optical stack of a wearable device, the left optical stack having first and second left eyepieces associated with first and second focal planes, respectively, and the right optical stack having first and second right eyepieces associated with the first and second focal planes, respectively, wherein each of the left optical stack and the right optical stack is configured to switch between displaying virtual content at the first focal plane or the second focal plane;

determining whether or not an activation condition is satisfied, wherein the activation condition is determined to be satisfied by determining that eye tracking data is unavailable while a user is using the wearable device; and

in response to determining that the activation condition is satisfied, activating a monovision display mode associated with the wearable device, wherein activating the monovision display mode includes:

causing the left optical stack to display the virtual content solely at the first focal plane by outputting the left virtual image light at the first left eyepiece and-causing the right optical stack to display the virtual content solely at the second focal plane by outputting the right virtual image light at the second right eyepiece; or

causing the left optical stack to display the virtual content solely at the second focal plane by outputting the left virtual image light at the second left eyepiece and causing the right optical stack to display the virtual content solely at the first focal plane by outputting the right virtual image light at the first right eyepiece.

16. The non-transitory computer-readable medium of claim 15 , wherein an optical power associated with the first focal plane and an optical power associated with the second focal plane differ by an offset amount.