Per capita is a Latin prepositional phrase: per (preposition, taking the accusative case, meaning âby, by means ofâ) and capita (accusative plural of the noun caput, âheadâ).The phrase thus means âby headsâ or âfor each headâ, i.e., per individual/person.The term is used in a wide variety of social sciences and statistical research contexts, including government statistics, economic indicators, and built environment studies.he phrase thus means âby headsâ or âfor each headâ, i.e., per individual/person. The term is used in a wide variety of social sciences and statistical research contexts, including government statistics, economic indicators, and built environment studies.
Medical Definition of trichromatism. 1  1: the quality or state of being trichromatic. 2  2: color vision based on the perception of three primary colors and especially red, green and blueâcompare deuteranomaly, protanomaly.
astigmatism is a common eye condition marked by an irregular curvature of the cornea this type of condition is also known as a refractive error and occurs in nearly everyone to some degree if the cornea is significantly curved the condition must be treatedowever the eye of a person with astigmatism is shaped more like a football or the back of a spoon for this person when light enters the eye it is refracted more in one direction than the other allowing only part of the object to be in focus at one time objects at any distance can appear blurry and wavy