Two websites that provide online vision tests are ESSILOR.com and SterlingOptical.com/Eye_Screening. Each website offers a range of different tests, including simple visual acuity and color perception.
The Essilor main page contains an Eye Care link with an option to test vision. Essilor offers tests for myopia, far and near vision, astigmatism, and color perception. Additional resources from Essilor include lens suggestions and general information about eye defects. Sterling Optical offers both distance and reading, astigmatism, and eye health tests on its screening page. The first page includes an image selection to determine the test-taker's monitor size and resolution. Sterling Optical also suggests finding a nearby eye wear store and making an appointment with their website.