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. Prevent sight and solar malfunctions with today's Groupon: for $50, you get a comprehensive eye exam at River City EyeCare in Clackamas (a $125 value). Doctors Bret Provost and Carrie Breeden focus on preventing peaked peepers with River City EyeCare's comprehensive exams, a thorough series of vision tests that suss out any inconsistencies in prescription strength. The exam includes a diagnostic checkup, with eye-health investigations designed to spot ocular troublemakers, such as cataracts, glaucoma, and pupil poltergeists.