Dimming of optical passthrough displays

A method comprising:

• at a device including one or more processors, non-transitory memory, an eye tracking camera, and a dimmable optical element:
• capturing, via the eye tracking camera, an image of an eye of a user;
• determining, based on the image of the eye of the user, an eye measurement of the user, including determining an extraocular muscle contraction of the user;
• determining whether the user is squinting or wide-eyed based on the extraocular muscle contraction of the user;
• and
• changing a transmission coefficient of the dimmable optical element based on the eye measurement of the user, including changing the transmission coefficient of the dimmable optical element based on whether the user is squinting or wide-eyed.

A method comprising:

• at a device including one or more processors, non-transitory memory, an eye tracking camera, and a dimmable optical element:
• capturing, via the eye tracking camera, an image of an eye of a user;
• determining, based on the image of the eye of the user, an eye measurement of the user, including determining an eyelid closure of the user;
• determining an alertness level of the user based on the eyelid closure of the user;
• and
• changing a transmission coefficient of the dimmable optical element based on the eye measurement of the user, including changing the transmission coefficient of the dimmable optical element based on the alertness level of the user.

A device comprising:

• an eye tracking camera;
• a dimmable optical element;
• a non-transitory memory;
• and
• one or more processors to:
• capture, via the eye tracking camera, an image of an eye of the user;
• determine, based on the image of the eye of the user, an eye measurement of the user;
• and
• change a transmission coefficient of the dimmable optical element based on the eye measurement of the user, including determining a base transmission coefficient of the dimmable optical element based on a current ambient light level and determining an adjusted transmission coefficient of the dimmable optical element based on the base transmission coefficient and the eye measurement of the user.

A non-transitory memory storing one or more programs, which, when executed by one or more processors of a device with an eye tracking camera and a dimmable optical element, cause the device to:

• capture, via the eye tracking camera, an image of an eye of the user;
• determine, based on the image of the eye of the user, an eye measurement of the user;
• and
• change a transmission coefficient of the dimmable optical element based on the eye measurement of the user, including determining a base transmission coefficient of the dimmable optical element based on a current ambient light level and determining an adjusted transmission coefficient of the dimmable optical element based on the base transmission coefficient and the eye measurement of the user.