The VisionCheck is a self-administered test, so results may vary based on your ability to take consistent, precise tests. The VisionCheck is an optical device powered by MIT-patented technology that measures refractive error and provides EyeQue Refraction Measurements (ERMs), which are the corrective powers needed to order new glasses and track changes in vision over time. In general, the margin of error for spherical and cylindrical measurements on glasses is within +/-0.25 diopters and many people’s vision may fluctuate that much daily. Many people also have a small acceptable range of correction that works well for them. The VisionCheck is accurate to within +/-0.50 diopters.
The margin of error for pupillary distance is within 1mm. It is important to conduct the self-administered test correctly to get the best results.
Our community of testers have provided hundreds of testimonials, many touting the accuracy of their test results with EyeQue devices when compared with recent eyeglass prescriptions. Read some of those here.