Israel’s BrainWatch Tech is developing a device that will continuously check a coma patient’s pupils for their reactions to light stimulus. Over a million patients suffer severe brain injury each year. Reaction to light signifies brain stem activity. No response suggests urgent medication or surgery.

https://www.timesofisrael.com/startup-hopes-to-track-coma-patients-condition-with-goggles-that-monitor-pupils/

https://ehealthventures.com/ehealthportfolio/21/