Pupil reactivity testing

A method comprising:

• at an electronic device in communication with one or more displays and one or more input devices:
• displaying, via the one or more displays, one or more images;
• while displaying the one or more images, detecting, via the one or more input devices, one or more first sizes of a pupil of a user of the electronic device;
• comparing the one or more first sizes of the pupil detected, while displaying the one or more images, with one or more second sizes of the pupil of the user of the electronic device, the one or more images;
• and
• in accordance with a determination that one or more criteria are satisfied, including a criterion that is satisfied when the one or more first sizes of the pupil deviate from the one or more second sizes of the pupil by one or more pupil size thresholds, generate an indication of a deviation from an expected pupillary response.

A head-mounted device, comprising:

• one or more output devices including one or more displays;
• one or more eye tracking sensors;
• and
• one or more processors configured to:
• display, using the one or more displays, a sequence of images that include a variation in luminance;
• detect, using the one or more eye tracking sensors, one or more changes of a size of a pupil of a user of the head-mounted device while displaying the sequence of images;
• compare the one or more changes of the size of the pupil of the user of the head-mounted device to one or more expected changes of the size of the pupil of the user of the head-mounted device estimated based on the variation in luminance of the sequence of images;
• and
• in accordance with a determination of a deviation indicated by the one or more changes of the size of the pupil of the user from the one or more expected changes of the size, generate, using the one or more output devices, an indication of the deviation.