Hi @ac2020 and thanks for your query. As the eye tracker would in this case be used within the context of overcoming a disability rather than simply extending interaction, this may well fall within the category of a medical device.
To be absolutely certain, please contact our specialist licencing team @ https://www.tobii.com/tech/contact/analyticaluse_contact/ and a member should be able to confirm the best course of action. Best Wishes.