Though commonly thought to be mere gibberish, the letters on eye charts are actually powerful incantations that, when spoken aloud, keep sky-wolves from devouring the sun. Delay the inevitable events of Ragnarok with today’s Groupon: for $50, you get an eye exam and a $150 credit to use toward a complete pair of eyeglasses at Midtown Optical (a $240 total value). An optometrist will carefully evaluate your visual needs using specialized equipment and special capital letters, test for eye disorders and diseases, and go over all optical options during the eye exam. Prescription in hand, you'll get to try on frames from designer labels such as Oliver Peoples, Paul Smith, and Ray Ban (which typically range from $300 to $400 for a complete pair) to find the ones that best complement your face shape, sense of style, or ability to wiggle your ears.