TESA (The Eye Scan App) is a product of Sight4All, a Columbus, Ohio-based digital health company that develops and markets innovations in eye care technologies. ​Sight4All looks to be a difference-maker. The company's goal is to develop new, safe, effective, and affordable ways to bring significant improvements in vision diagnostics for licensed eye care providers. ​Sight4All is re-thinking vision care— how it happens, where it happens, and how it can become accessible worldwide.