Visual impairment, also known as vision impairment or vision loss, is a decreased ability to see to a degree that causes problems not fixable by usual means, such as glasses. Some also include those who have a decreased ability to see because they do not have access to glasses or contact lenses. Visual impairment is often defined as a best corrected visual acuity of worse than either 20/40 or ...
The American Foundation for the Blind states that 20/200 vision is the clinical definition for legal blindness. Therefore, a person with 20/600 vision is considered legally blind. With 20/600 vision, an individual sees people only as shapes, WPTV indicates. CNN explains that this level of eyesight impairment is comparable to a newborn's eyesight.
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.
However, 20/20 vision is not perfect vision. A person can have 20/15 vision, which is sharper than average. If you have 20/15 vision, you can see a line in the eye chart at 20 feet that the average person can only see when they are 15 feet away. Generally, the goal of correcting vision with glasses or contacts is to bring a person’s vision to ...
Normal vision is 20/20, which means you can read an eye chart at 20 feet. To be considered legally blind, your vision needs to be 20/200 or worse, which means you can read an eye chart at 20 feet ...
A person with 20/50 vision is considered to have visual impairment, according to WebMD. Individuals with 20/50 visual acuity can see an object clearly at 20 feet away that individuals with normal vision can see clearly at 50 feet away. Those with 20/20 visual acuity are defined as having normal vision, according to All About Vision.
What Does 20/400 Mean. We measure your quality of vision at 20 feet-this is the numerator (top twenty). The denominator (bottom 400) is a comparison to someone with standard vision. So if you have 20/400 vision you would have to be at 20 feet to see what one with standard vision would see at 400 feet.
So if you can read the 40 line, your vision is 20/40, and a person with good vision should be able to read that line from 40 feet away, while you have to get up to 20 feet to barely read it. As you may be learning at this point, this is all pretty rough, despite those convincing looking decimal points in a prescription like -4.25.
20/600 vision means you need to be twenty feet away from a standard letter size to recognize it; but the same sized letter could be seen at a distance of 600 feet by a patient with normal vision. The definition of legal blindness is explained in a response to a previous question (see link below), which was posted on 4/22/98. Related Resources:
How bad is my eyesight? My prescription is 500/700. Update Cancel. a d b y q u i p. How long should you brush your teeth for? The ADA’s rec is 2 minutes, but over 90% of us don’t brush that long. ... If you can’t see a sharp image, ask the optician what your best corrected vision is, usually 20/xx or 6/xx.