Since richer nations would have lower levels of absolute poverty, relative poverty is considered the "most useful measure for ascertaining poverty rates in wealthy developed nations" and is the "most prominent and most-quoted of the EU social inclusion indicators".Usually, relative poverty is measured as the percentage of the population with income less than some fixed proportion of median income. This is a calculation of the percentage of people whose family household income falls below the Poverty Line. The main poverty line used in the OECD and the European Union is based on "economic distance", a level of income set at 60% of the median household income. The United States federal government typically regulates this line to three times the cost of an adequate meal.There are several other different income inequality metrics, for example, the Gini coefficient or the Theil Index. Other aspects
Rather than income, poverty is also measured through individual basic needs at a time. Life expectancy has greatly increased in the developing world since World War II and is starting to close the gap to the developed world. Child mortality has decreased in every developing region of the world. The proportion of the worlds population living in countries where the daily per-capita supply of food energy is less than 9,200 kilojoules (2,200 kilocalories) decreased from 56% in the mid-1960s to below 10% by the 1990s. Similar trends can be observed for literacy, access to clean water and electricity and basic consumer items.
Polycoria is a pathological condition of the eye characterized by more than one pupillary opening in the iris. It may be congenital or result from a disease affecting the iris. It results in decreased function of iris and pupil, affecting the physical eye and visualization. In the early history of China, double pupils were seen as a sign that a child would become a great king or sage. Epidemiology
Polycoria is extremely rare, and other conditions are frequently mistaken for it. Polycoria is often congenital, however not diagnosed until adulthood. The general cause of polycoria is unknown, but there are some other eye conditions that are in association with polycoria. These include (although not often) polar cataracts, glaucoma, abnormally long eyelashes, abnormal eye development, and poor vision.There have been cases diagnosed from age 3 to adulthood. The prevalence of true polycoria is minimal. The two kinds of polycoria are true polycoria and false pseudopolycoria. There are no known or proposed trends in the occurrences of polycoria based on geographical location, age, gender, or season. True polycoria
In cases of true polycoria, there is an extra pupil that tends to be reactive to light and medication. To be considered true polycoria the extra pupil and the principal pupil must dilate and contract simultaneously with triggers such as light and administered drugs. The extraneous pupil is c. 2.5mm away from the principal pupil. In cases of true polycoria there is an intact sphincter muscle, which contracts and dilates the pupils.