Visual acuity of 20/80 is not "bad" enough for a patient to be legally blind, according to the Social Security Administration. Patients with 20/80 vision may need eyeglasses or contact lenses to aid with the visual acuity needed to accomplish basic tasks such as writing a check or reading the newspaper, states the Emory Eye Center.Continue Reading
The Social Security Act defines an individual as having statutory blindness with a corrected vision of 20/200 or less. Since the Snellen acuity chart, best known as the eye chart with the large "E" at the top, has no lines between 20/100 and 20/200, Social Security categorizes anyone unable to recognize any letters on the 20/100 line as statutorily blind.
With 20/80 vision, patients are able to see objects at 20 feet away that those with normal or 20/20 vision can see from a distance of 80 feet. The Snellen acuity chart measures a patient's visual acuity, but does not reveal why he is having difficulty seeing. Doctors work with the patient to make this discovery and make the appropriate corrections, according to Ophthalmic Technician.
According to the American Medical Society, all but three states require an individual to have vision corrected to at least 20/40 in the better eye to drive a car. Drivers who require corrective lenses to meet these guidelines have restricted licenses. Federal guidelines for commercial drivers are even stricter than those for non-commercial drivers.Learn more about Vision
According to MedlinePlus, a visual acuity measurement of 20/25 is only slightly worse than average. What "20/25" basically means is that a person's eye can see at 25 feet what a typical eye can see at 20 feet.Full Answer >
A visual acuity of 20/200 is considered low vision, not far removed from legal blindness. WebMD defines low vision as a visual acuity of between 20/70 and 20/200, with corrective measures such as eyeglasses employed.Full Answer >
During eye exams, optometrists use eyesight charts to gauge patients' visual acuity by asking them to read letters from the smallest line they can see. The general guideline concerning eyesight charts is that a person with normal 20/20 vision should be able to read up to at least eight lines of text from 20 feet away. When determining eyeglass prescriptions, optometrists adjust lens strength until their patients have at least 20/20 visual acuity according to the chart.Full Answer >
In humans, perfect vision is a visual acuity of 20/20. The first number in 20/20 refers to the distance at which a person can see a particular object in daylight; the second number refers to the distance a human eye with perfect vision can see the object.Full Answer >