I'll check out the prices and options on the 1.67 photochromic lenses there. Looking at Zenni Optical's website (the cheapest I have found for regular lenses / frames - and you can read my review of Zenni here) it says that their 1.67 index lenses start at $34.95 and the photochromic lenses are $27.
Legitimate Power. Legitimate power is also known as positional power. It's derived from the position a person holds in an organization's hierarchy. Job descriptions, for example, require junior workers to report to managers and give managers the power to assign duties to their juniors.
Political sovereignty refers to the highest level of absolute power through which independent states are controlled by a designated political authority. Political sovereignty is sometimes called supreme will, and includes control of a specific state granted through a constitution or other enabling law, and carried out through an established government.