King didn't get radicalized by the urban riots of the 1960s or Vietnam; he was already a radical, says Thomas Jackson, author of From Civil Rights to Human Rights: Martin Luther King, Jr. and the Struggle for Economic Justice..
Here are the definitions of the symbols/abbreviations used in a typical contact lens prescription: 1  Eye - Which eyes the prescription line item is for. 2  SPH - Sphere (this can also be referred to as Power or PWR) 3  BC - Base Curve (usually a number between 8 and 10)  DIA - Diameter (usually a number between 13 and 15)
The more nearsighted (or farsighted) you are, the higher your prescription in diopters. On your prescription, youâll see some letters followed by a series of numbers. The letters âODâ indicate that the prescription is for your right eye; âOSâ represents your left eye. Refractive Power â The first number in the series identifies your degree of nearsightedness or farsightedness. A plus sign (+) indicates you are farsighted, a minus sign (-) indicates you are nearsighted.