THEA is an ARPA-H research program pursuing whole functional eye transplantation as a potential way to restore vision for people who are blind or visually impaired. Its work addresses donor-eye retrieval and preservation, optic nerve repair and regeneration, and the surgical procedures, post-operative care, and functional assessment needed for transplantation. The program also aims to develop technologies or therapies that preserve or regrow nerves connecting the eye to the brain. ARPA-H describes these regenerative approaches as potentially relevant to other forms of nervous-system damage.