Appointment required. Consultation required; non-candidates and other refund requests will be honored...
show more
Appointment required. Consultation required; non-candidates and other refund requests will be honored before service provided. Limit 1 per person, may buy 1 additional as gift(s). May be repurchased every 30 days. Limit 1 per visit. Valid only for option purchased. All goods or services must be used by the same person. Merchant's standard cancellation policy applies (any fees not to exceed voucher price).
An optometrist inspects eyes to determine prescriptions and check for ailments; $120 credit toward a pair of glasses
The Deal
$48.40 for a comprehensive eye exam ($360 total value)
- Eye exam ($100 value)
- Dry-eye evaluation ($80 value)
- $120 toward a pair of glasses
20/20 Vision: An Imperfect Ratio
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.
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 United States, 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.