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)
All three are components of the contact lens prescription. Power refers to the actual refractive correction in the lens. BC stands for base curve and specifies the shape of the lens (or shape of a specific area of a lens in more complex lens designs). DIA is short for diameter and denotes the overall size of the lens.