Symptoms of migraines include nausea, sensitivity to light or sound, pounding pain, and some visual symptoms, including a blurred spot in the field of vision, seeing zigzag lines or shimmering lights. Treatment is first aimed at determining the factors that may precipitate a migraine. These includ...
• a moderately wideapparent field of view, large enough to include a generous area around the double star but small enough that the circumference of the field stop is visible in your peripheral vision when you focus your gaze at the center. For most people this is an apparent field of v...