Prescription glasses help improve your visual acuity, which compares your vision to the 20/20 standard. Read on to find out what this metric really means.
20/20 Vision: An Imperfect Ratio
Possessing 20/20 vision may be considered perfect, a level of visual acuity reserved for Navy pilots and the bald eagles that train them, but in fact it's not even close to average. Developed by Dutch optometrist Hermann Snellen in the 1860s, the 20/20 standard is a somewhat arbitrary distinction. After inventing his now-iconic eye chart—which consists of lines of standardized letters that get progressively smaller—Snellen also instituted the concept of a ratio to define the clarity of a patient's vision. The denominator represents how many feet away a person of normal visual acuity could stand while still discerning the letters with the same level of clarity as the patient.
In other words, 20/40 vision means the patient needs to stand 20 feet away to make out the same size letters as a person with standard vision can from 40 feet.
Because the 20/20 standard is arbitrary, many people actually have considerably better eyesight, represented by such ratios as 20/15 or 20/10. In fact, in the U.S., the average visual acuity is sharper than 20/20 until about age 60 or 70, when people's vision naturally starts to decline as their bangs finally grow past their eyes. Also, though it's useful for determining basic shortcomings of vision, an eye chart can't diagnose a proper glasses or contact prescription. To determine that, optometrists test many other factors, including depth perception, peripheral vision, x-ray vision, and focusing skills.
Though there are 115 For Eyes Optical stores around the United States, the company still has the heart of a small start-up. In Philadelphia in 1972, a few friends had an idea to create an optical store that combined a friendly and open environment with a fair pricing structure and quality product. Today, they take pride in their continued commitment to value and customers.
In each store, expert independent doctors test clients' visual acuity and general eye health with comprehensive exams. Then, a store associate helps each person outfit their eyes with designer frames by brands such as Burberry, Prada, Ray-Ban, and more. For Eyes Optical has its own advanced 40,000-square foot optical lab in in Hialeah, Florida, where technicians shape, surface, and coat the lenses to fit each person's exact prescription. After creating the lenses—whether plastic, polycarbonate, or trivex Toughlites—they inspect and fit each into its corresponding frame by hand, a process that ensures quality control and guards against the robots, whose first objective is to hinder our eyesight.
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At Advanced Family Eyecare Center, you can complete your eye exam and get a new pair of glasses or contacts all in one place.
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With locations throughout the Midwest, Vision Center At Meijer's eye mavens outfit more than 700 frames with lenses carefully crafted in their own laboratory to specifically suit the eyes and face of each patient. Doctors demonstrate their care for patients' eyes by making sure all of them have a precise, up-to-date prescription. The center also works to keep frame prices low to help more patients find pairs of glasses within their price ranges.
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