The object of convergence is the directing of the yellow spot in each eye towards the same point, so as to produce singleness of vision; diplopia, or double vision, at once resulting when the image of an object is formed on parts of the retina which do not exactly. correspond in the two eyes.
Hives are red, itchy, slightly elevated swellings. Itching may be severe. Hives have clearly defined borders and may have a pale center. Typically, crops of hives come and go. One hive may remain for several hours, then disappear, and later, another may appear elsewhere.
By Shelby D Burns, February 25, 2013. Hives, or urticaria, affect about 20 percent of all people at one time or another. They can start as a simple itch followed by swollen, red welts. The itching may be mild and annoying to severe and debilitating. Some things can make it worse: aggressive scratching, alcoholic beverages, exercise, and emotional stress.