Spectacular Museum
Wonderful site with real images of actual specimens - BUT impresise dates. Good general knowledge - but without quoting sources or precises dates makes this as an entire whole - needing backup.

Spectacles, Lorgnettes & Monocles
By D C Davidson & R J S MacGregor - Published by Shire Publications - 2002

Fashions in Eyeglasses
by Richard Corson ISBN: 0720605776 - out of print everywhere...

Eyeglasses - Early works to 1800
by James Ayscough

Illustrated History of Early Antique Spectacles
Hugh Orr, ISBN: 0951058401 - great photographs!