Acuity is the measure of the eye's ability to distinguish the smallest identifiable letter or symbol, its details and shape, usually at a distance of 20 feet. This measurement is usually given in a fraction. The top number refers to the testing distance measured in feet and the bottom number is the distance from which a normal eye should see the letter or shape. So, perfect vision is 20/20. If your vision is 20/60, that means what you can see at a distance of 20 feet, someone with perfect vision can see at a distance of 60 feet.
Sharpness of vision, measured by the ability to discern letters or numbers at a given distance according to a fixed standard.If you have a recorded visual acuity (e.g. 6/60 or 20/200) these web pages should allow you to obtain a print out of the size of images that you should be able to see easily at different distances.A person's visual acuity reflects only one aspect of their vision. There are many other aspects of vision such as refractive error, accomodation, contrast sensitivity, cognitive visual function, visual fields and eye movements which will all impact on how well a person sees and uses their vision.
Visual acuity is a number that indicates the sharpness or clarity of vision.A visual acuity measurement of 20/70 means that a person with 20/70 vision who is 20 feet from an eye chart sees what a person with unimpaired (or 20/20) vision can see from 70 feet away.20/70 can best be understood by examining a standard eye testing chart that you may have used in your own doctor's office during an eye examination.
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