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.
power, authority, jurisdiction, control, command, sway, dominion mean the right to govern or rule or determine. power implies possession of ability to wield force, authority, or influence. the power to mold public opinion; authority implies power for a specific purpose within specified limits.