Tear volume measurements with a head mounted device

An electronic device in communication with one or more displays and one or more input devices including one or more cameras, the electronic device comprising:

• one or more processors;
• memory;
• and
• one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including instructions for:
• in accordance with a determination that one or more first criteria are satisfied, obtaining, via the one or more cameras, a plurality of images, wherein the plurality of images includes one or more eyes of a user of the electronic device;
• in accordance with a determination that one or more second criteria are satisfied, determining a tear volume measurement for one or more of the plurality of images of the one or more eyes of the user of the electronic device;
• and
• in accordance with a determination that one or more third criteria are satisfied, including a criterion that is satisfied when the tear volume measurement is below a tear volume threshold, determining a dry-eye condition associated with the one or more eyes of the user of the electronic device.