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.
That is, a particular rule or norm is legitimate if it enjoys support from the relevant set of actors.[2] While Gelpi is discussing legitimacy at the international level, the same two approaches, and sometimes more, can be used in dealing with legitimacy on any level of political organization.