Respuesta :
'An eye exam every one to two years is important to monitor changing conditions in the patient's vision.
An eye chart measures visual acuity. H. Clarity or sharpness of vision. The top number is the distance in feet from the map. The bottom number is the distance a person with normal vision can read the same line. For example, if your visual acuity is 20/30, it means your vision is worse than average.
Many parts come together in the eyes and brain to see things. Your vision is born here. The lens, retina, and optic nerve are the key parts of the eye that allow light and electrical signals to be converted into images.
20/20 visual acuity is normal visual acuity (clearness or sharpness of vision) measured at a distance of 20 feet. If you have 20/20 vision, you can clearly see things that are normally seen at a distance 20 feet away.
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