Tom Davies started designing custom eyewear back in 1977 and has fitted sheiks to Kevin Bacon with his own branded BeSpoke spectacles. If the wearer wants a pair of Bespoke custom eyeglasses, Tom Davies works the optician for measurements and color. In 2009 he made 36,000 frames up from 2008 and they cost approximately $600 USD. Fast Company did a good story on Tom Davies and you can read it here for more information. (www.fastcompany.com/magazine/143/next-design-golden-eye.html?#)
This a the short version of eyewear being made, other youtubes videos available.