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.
Hives (AKA urticaria) is not contagious by any means. They are a skin disorder that results in red, sometimes itching patches of raised skin. The patches of skin can be small or large, and generally appear quite fast and disappear on their own within hours or days.