The standard definition of normal visual acuity (20/20 or 6/6 vision) is the ability to resolve a spatial pattern separated by a visual angle of one minute of arc. The terms 20/20 and 6/6 are derived from standardized sized objects that can be seen by a person of normal vision at the specified distance. For example, if one can see at a distance of 20 ft an object that normally can be seen at 20 ft, then one has 20/20 vision. If one can see at 20 ft what a normal person can see at 40 ft, then one has 20/40 vision.
Constitutional amendments adopted during Reconstruction were intended to-provide legal and political rights for African Americans-end property and religious qualifications for voting-correct problems with the electoral college system-limit the number of terms of the president.
The African-American Civil Rights Movement (1955--1968) refers to the social movements in the United States aimed at outlawing racial discrimination against black Americans and restoring voting rights to them.This article covers the phase of the movement between 1955 and 1968, particularly in the South.he African-American Civil Rights Movement (1955--1968) refers to the social movements in the United States aimed at outlawing racial discrimination against black Americans and restoring voting rights to them.