An Optometrist was performing a complete physical, including the visual acuity test. He placed the patient twenty feet from the chart and began, – “Cover your right eye with your hand.” The man read the 20/20 line perfectly. – “Now your left.” Again, a flawless read. – “Now both,” The Optometrist requested. There was silence. The man couldn’t even read the large E on the top line. The Optometrist turned and discovered that the man had done exactly what he’d been asked: he was standing there with both his eyes covered.