Prescription adjustment methods and systems for varifocal subsystems

1. A head-mounted display system, comprising:

a display subsystem configured to display an image to a user;

an optics subsystem comprising at least one lens;

a prescription accommodation subsystem comprising a prescription accommodation actuator configured to adjust a focus of the image to account for the user's visual refractive error; and

a varifocal adjustment subsystem comprising a varifocal adjustment actuator configured to further adjust the focus of the image viewed by the user through the optics subsystem to change a perceived view of the image on the display subsystem, wherein the prescription accommodation actuator comprises a manual adjustment input for the user to adjust a position of the varifocal adjustment subsystem within the head-mounted display system.

2. The head-mounted display system of claim 1 , wherein the prescription accommodation subsystem is configured to adjust the focus of the image by adjusting a distance between the display subsystem and the optics subsystem.

3. The head-mounted display system of claim 1 , wherein the varifocal adjustment actuator is configured to modify a shape of a lens of the optics subsystem to adjust the focus of the image.

4. The head-mounted display system of claim 1 , wherein the varifocal adjustment subsystem is mounted on the prescription accommodation subsystem to be moved by the prescription accommodation actuator.

5. The head-mounted display system of claim 1 , wherein the varifocal adjustment actuator is configured to adjust the focus of the image by adjusting a distance between the display subsystem and the optics subsystem.

6. The head-mounted display system of claim 1 , wherein the varifocal adjustment actuator is mounted on a movable structure of the prescription accommodation subsystem.

7. The head-mounted display system of claim 1 , further comprising a locking system configured to lock a setting of at least one of the prescription accommodation subsystem or the varifocal adjustment subsystem when the head-mounted display system is powered down.

8. A method for adjusting at least one optical property of a head-mounted display system, comprising:

displaying an image on a display subsystem of a head-mounted display system for viewing by a user through an optics subsystem comprising at least one lens;

adjusting, with a prescription accommodation actuator of a prescription accommodation subsystem, a focus of the image to account for the user's visual refractive error by manipulating a mechanical user input; and

further adjusting, with a varifocal adjustment actuator of a varifocal adjustment subsystem, the focus of the image viewed by the user through the optics subsystem to change a perceived view of the image on the display subsystem.

9. The method of claim 8 , wherein the step of adjusting to account for the user's visual refractive error is performed based on an input from the user.

10. The method of claim 8 , wherein the step of adjusting to account for the user's visual refractive error is performed based on one or more settings, retrieved from a computer memory, corresponding to the user's visual refractive error.

11. The method of claim 8 , wherein:

adjusting, with the prescription accommodation actuator, the focus of the image comprises adjusting the distance between the display subsystem and the optics subsystem across a maximum prescription range; and

further adjusting, with the varifocal adjustment actuator, the focus of the image comprises adjusting the distance between the display subsystem and the optics subsystem across a maximum varifocal range that is shorter than the maximum prescription range.

12. The method of claim 8 , wherein the step of further adjusting, with the varifocal adjustment actuator, the focus of the image is performed using one or more piezoelectric actuators or voice coil actuators of the varifocal adjustment subsystem.

13. The method of claim 8 , wherein the step of further adjusting, with the varifocal adjustment actuator, the focus of the image is performed using a rotary actuator and a leadscrew of the varifocal adjustment subsystem.

14. The method of claim 8 , wherein the step of further adjusting, with the varifocal adjustment actuator, the focus of the image is performed based at least in part on data received from an eye-tracking system.

15. The method of claim 8 , wherein adjusting, with the prescription accommodation actuator, the focus of the image comprises adjusting a position of the varifocal adjustment actuator.

16. The method of claim 8 , wherein the step of further adjusting, with the varifocal adjustment actuator, the focus of the image is performed in response to an electronic signal.

17. The method of claim 8 , further comprising automatically detecting the user's visual refractive error prior to adjusting to account for the user's visual refractive error.

18. A non-transitory computer-readable medium comprising one or more computer-executable instructions that, when executed by at least one processor of a computing device, cause the computing device to:

display an image on a display subsystem of a head-mounted display system for viewing by a user through an optics subsystem comprising at least one lens;

adjust, with a prescription accommodation actuator of a prescription accommodation subsystem, a focus of the image on the display subsystem to account for a user's visual refractive error;

adjust, with a varifocal adjustment actuator of a varifocal adjustment subsystem, the focus of the image on the display subsystem viewed by the user through to optics subsystem to change a perceived view of the image on the display subsystem; and

lock, with a locking system, a setting of at least one of the prescription accommodation subsystem or the varifocal adjustment subsystem when the head-mounted display system is powered down.