Essilor.com, SterlingOptical.com, PreventBlindness.com, Opternative.com and Zeiss.com are some websites that offer online eye tests as of 2015. In most cases, these tests serve as screening tests that alert the user to visual issues that need the attention of an eye doctor.
Essilor offers online tests for myopia, near vision, far vision, astigmatism and color perception. Similarly, Sterling Optical offers online tests for distance, reading, astigmatism and eye health. Prevent Blindness offers near vision and distance vision tests as well as an age-related macular degeneration test. Zeiss provides visual acuity, contrast vision and color vision checks.
Opternative offers an online vision test that it claims is as accurate as a professionally conducted in-person eye exam. Users sign up for free, take the eye exam using a computer or smartphone, and pay a fee to have an ophthalmologist review the results and provide a signed prescription for corrective lenses.