Vision 0.8 is 4:00 something

Vision is the ability of retina to distinguish images. Vision is judged by the size of retina's ability to distinguish images. Vision is divided into central vision and peripheral vision. Central vision reflects the function of the fovea of the retina and is the ability of the human eye to recognize the shape and size of external objects. Peripheral vision is also called peripheral vision. Normal vision refers to distance vision, and is central vision, it reflects the most sensitive parts of the retina, macular area function, distance vision examination is normally carried out with the eye chart. 0.8 refers to the international eye chart, the international eye chart corresponds to the logarithmic eye chart is 4.9 vision.