Though commonly thought to be mere gibberish, the letters on eye charts are actually powerful incantations that, when spoken aloud, keep the sky-wolves from devouring the sun. Do your part with today’s Groupon: for $35 you get an eyecare package at Dalmo Optical’s Squirrel Hill location (a $150 total value). The package includes the following:

• An eye exam (a $50 value)
• $100 toward a complete pair of prescription eyeglasses or sunglasses<p>

Now helmed by a second generation of eyewear aficionados, Dalmo Optical has been clarifying blurry vision for half a century. During the eye exam, a skilled sight specialist examines eyes for signs of nearsightedness, farsightedness, and nitpickiness. After scores are tallied, the friendly staff helps fit faces with a flattering pair of frames from brands such as Dior, Gucci, and Marc Jacobs ($149–$600 for a complete pair). Dalmo Optical’s in-house lab ensures timely lens-frame bonding, with most single-vision spectacles ready to wear home in as a little as an hour. Peepers seeking protection from UV rays and Medusa’s gaze can also peruse a selection of prescription sunglasses ($69–$249).