$59 for Eye Exam and $200 Toward Prescription Glasses at Sezani & Co Optical ($245 Value)

Midtown South Central

$59
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In a Nutshell

Optometrist with more than 20 years' experience examines eyes before filling designer frames by Gucci and Ray-Ban with prescription lenses

The Fine Print

Expires 90 days after purchase. Limit 1 per person, may buy 1 additional as a gift. Limit 1 per visit. Appointment required. 24-hr cancellation notice required. Not valid with insurance. Consultation required; non-candidates and other refund requests will be honored before service provided. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

Sunglasses have tons of uses, from making your dog look like a blues musician to making your desktop cactus look like a blues musician. Look as cool as a blues musician with this Groupon.

The Deal

  • $59 for an eye exam and $200 toward prescription eyeglasses or sunglasses ($245 total value)

Polarized Lenses: Blocking the Glare

The inventory includes sunglasses with polarized lenses. Learn exactly what that means with Groupon’s introduction to this technology.

When light leaves the sun, it’s kind of aimless. As a ray barrels through space at the speed of, well, light, the advancing electromagnetic field that makes up a light wave fluctuates in strength around the direction of the ray in many different planes.

It’s the job of polarized lenses to get this erratic light in line. A polarizing filter consists of microscopic crystals in which strands of molecules are all aligned parallel to each other. When unpolarized light hits the filter, those molecule chains absorb any energy that’s traveling in the same plane they’re aligned in, blocking it from passing through. What emerges on the other side is now polarized, with all its energy fluctuating within a single plane.

Why worry about how a wave of light gets to you at all? As anyone who’s ever squinted through the too-bright reflection from a car’s hood or a body of water can sense, light polarized in certain directions can be dangerous. When light bounces off horizontal surfaces, it becomes horizontally polarized, resulting in the blinding phenomenon known as glare. For this reason, sunglasses with polarized lenses are coated with (or, in some cases, formulated containing) a filter that blocks this horizontal light, allowing through only the gentler vertical components in the environment. This improves safety for drivers, beachgoers, boaters, and whale ranchers, although not for downhill skiers—on the slopes, you need to see horizontally reflected light to alert you to icy patches ahead.

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    Midtown South Central

    1006 6th Avenue

    New York, New York 10018

    212-764-6133

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For those who dress to thrill