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)
Decoding the Terms to Understand Your Contact Lens Prescription 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. In addition to the listed items below, some prescriptions may note how often your lenses must be replaced.