Visual acuity (VA) is acuteness or clearness of vision, which is dependent on the sharpness of the retinal focus within the eye and the sensitivity of the interpretative faculty of the brain.
Vision or Visual Acuity (VA) is tested by reading a Snellen eye chart at a distance of 20 feet (6 meters).
The eye doctors have decided what a "normal" human being should be able to see when standing 20 feet away from an eye chart.
If you have 20/20 vision, that means when you stand 20 feet away from the chart, you can see what a "normal" human being can see. In other words, if you have 20/20 vision your vision is "normal". Many people can see what you can see at 20 feet.
If you have 20/40 (6/12) vision, that means when you stand 20 feet away from the chart you can only see what a normal human can see when standing 40 feet from the chart.
If Visual Acuity is 20/100 means that when you stand 20 feet from the chart you can only see what a normal person standing 100 feet away can see. For those with 20/200 vision is considered to be legal blindness in the United States.
You can also have vision that is better than the norm. A person with 20/10 vision can see at 20 feet what a normal person can see when standing 10 feet away from the chart.
An eye exam seeks to find the prescription that will provide you at least 20/20 or 6/6 vision.
Examination of the eye, visual acuity and visual fied. WATCH VIDEO.
The eye doctors have decided what a "normal" human being should be able to see when standing 20 feet away from an eye chart.
If you have 20/20 vision, that means when you stand 20 feet away from the chart, you can see what a "normal" human being can see. In other words, if you have 20/20 vision your vision is "normal". Many people can see what you can see at 20 feet.
If you have 20/40 (6/12) vision, that means when you stand 20 feet away from the chart you can only see what a normal human can see when standing 40 feet from the chart.
If Visual Acuity is 20/100 means that when you stand 20 feet from the chart you can only see what a normal person standing 100 feet away can see. For those with 20/200 vision is considered to be legal blindness in the United States.
You can also have vision that is better than the norm. A person with 20/10 vision can see at 20 feet what a normal person can see when standing 10 feet away from the chart.
An eye exam seeks to find the prescription that will provide you at least 20/20 or 6/6 vision.
Examination of the eye, visual acuity and visual fied. WATCH VIDEO.
