There is an app called Opternative that checks your visual acuity. For $40, an ophthalmologist can review the findings from the app remotely and write a lens prescription.
Optometrists and ophthalmologists have obvious concerns about relying entirely on this app, although at least the American Academy of Ophthalmology seems cautiously optimistic.
Online Eye Exam Site Makes Waves In Eye Care Industry • 2016 May 25 • Bradley George • All Tech Considered • NPR
American Academy of Ophthalmology Provides Information to the Public on Online Vision Testing for Corrective Eyeglass Prescriptions • 2015 Sep 22 • American Academy of Ophthalmology