$49 for Complete Eye Exam plus $100 Toward Glasses at Matrix Vision ($168 Off)

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When stranded in the wilderness, glasses can help you turn sunbeams into fire or look smart as you explain the inedibility of man to a family of grizzly bears. Equip your eyes for the great outdoors with this Groupon.

The Deal

  • $49 for complete eye exam and $100 toward a complete pair of glasses ($168 value)

The included eye exam will determine 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.

In a Nutshell

In eye ware boutique, optometrist with more than 10 years experience pinpoints prescriptions and points the way to cases of designer frames

The Fine Print

Expires 120 days after purchase. Limit 1/person, may buy 1 add'l as gift. Limit 1/visit. Appointment req'd. 24-hr cancellation notice req'd or a $25 fee will apply. New patients only. Not valid with insurance. Must purchase complete pair of glasses (frame and no-glare premium lenses). Not valid for sale items. Consultation required; non-candidates and other refund requests will be honored before service provided. If medical condition excludes the needs for glasses, patient will be charged for a medical visit starting at $79 and up. Services must be used by the same person. Must use promotional value in 1 visit. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

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