Introduction During an eye examination, the optometrist will locate the smallest letter you are able to read and request that you read it. If you can read the lower row of letters, the vision sharpness (sharpness) is excellent. The eye chart wall poster is now getting an upgrade, with the newcomer Heru AI VR 30m D1 seeking to make vision tests a part of the virtual reality … [Read more...] about AI VR 30M D1 | Product by Heru International