A person with 20/25 vision can stand 20 feet from an eye chart and see the same detail as a person who has 20/20 vision that stands 25 feet from the same chart, according to Divyesh Eye Hospital. The term "20/25 vision" is used to describe the quality of a person's vision compared to someone with 20/20 vision, which is considered “normal” or “average” vision.Know More
Divyesh Eye Hospital explains that 20/20 vision is not necessarily “perfect” vision although some people believe that to be the case. Rather, this figure is used for comparison purposes. Some people can see better than 20/20. For example, someone with 20/15 vision can see at 20 feet what the average person can see at 15 feet. Alternatively, someone with 20/40 vision must stand 20 feet away from the eye chart to see the same amount of detail that a person with 20/20 vision can see at 40 feet.
These comparisons have several practical uses, says Divyesh Eye Hospital. For example, they are used to determine the cut-off for legal blindness, which is 20/200 in the United States. They are also used to determine eligibility and licensing requirements for certain occupations. To obtain a pilot's license, 20/20 vision is commonly required. One must have 20/40 vision to gain a driver’s license without the requirement of corrective lenses, and 20/80 may be used as a qualification for special education assistance.Learn More
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.Full Answer >
Someone with "20/30 vision" stands 20 feet from a reading chart but sees letters and objects that people with normal vision see 30 feet away from the chart, according to the University of Iowa. The first number, 20, is the distance from the eye chart and the second number, 30, shows the size of the letters read at that distance.Full Answer >
Crizal lenses are anti-reflective and provide comprehensive UV protection. They have a range that is specially designed for children. Crizal lenses protect the eyes from the Blue-Violet light emitted by electronic gadgets.Full Answer >
Blue sclera, a bluish or purplish tint found in the white portion of the eyes, most commonly indicates a condition called osteogenesis imperfecta, or OI, which is a congenital disease that prevents the body from producing type I collagen, according to the American Academy of Orthopaedic Surgeons. The blue tint is caused by thin or transparent scleral collagen found within the eye.Full Answer >