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.
If you have hives, you will notice a skin rash that appears all of a sudden and causes itchy, pale swellings on your skin. The rash can appear anywhere on your body and burns severely. About 20% of people experience hives at least once in their lives.