The classic case of optic neuritis (ON) attack starts with the initial symptom of simple blurred vision. There is usually a sudden onset - the medical term for the occurrence of the first symptom. ON commonly occurs in one eye and vision can be described as blurry, foggy, misty, cloudy, fuzzy, or distorted.
Learner's definition of DEMOGRAPHIC. 1. demographics [plural] : the qualities (such as age, sex, and income) of a specific group of people. The town's demographics suggest that the restaurant will do well there. The newspaper will be making some changes in order to adapt to the region's shifting demographics. The demographics of the disease are changing, and we are seeing much younger people being affected by it. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. 2. [count] : a group of people that has a particular set of qualities â usually singular. The magazine is trying to reach a younger/older demographic.
Since Thomas Malthus' population predictions to Paul Erlich's forecast of the population bomb, people have been interested in the effects of population. Future trends in population size, age structure, births, deaths and other demographic variables are of interest to a wide range of analysts, specifically demographers. Demography is the study of the size, distribution and composition of a population and its components of change, which includes fertility, mortality and migration. Demographers study populations to determine the causes and consequences of changes in population size, distribution and structure. They plan and conduct research designed to study the characteristics of human populations, such as growth and structure.