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.
The itchy, red, raised rash that comes with allergic reactions is called hives -- or in fancy medical terminology, urticaria. Anything that causes an allergic reaction can cause hives. Some of the most common causes are bee stings, mosquito bites, soaps, detergents, foods, medications and plants. You don't have to touch something to develop hives. For instance, allergic reactions to food can result in hives.