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)
Understanding your contact lens prescription requires you to understand the terminology used to write it. Below are brief descriptions of the items that should be on the label of your contact lenses and what they mean to you and your eye care professional.his stands for base curve. Itâs the back curvature of your contact lens, which is measured in millimeters. For best fit, comfort, and eye health itâs prescribed to match or complement the curvature of your cornea. The lower the number, the steeper your cornea.