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.
Senator Charles Sumner wanted to guarantee political and legal equality for African-Americans and educate them. Representative Thaddeus Stevens wanted to punish the south for the injustices and discriminations that African-American southerners had suffered under white rule. Also, he wanted African-Americans to have economic independence. Although most Republican leaders eventually lined up with Lincolnâs reconstruction policies, most agreed that the president had gone beyond his Constitutional powers and it was for Congress to say what rules would be used in restoring the southern states to the Union.