History on Your Face - Common Spectacle Styles Before,
During and After the Civil War, 1835 - 1870
This article is a good look at period eyewear, it's shapes and types. You can find it by clicking http://www.historiceyewearcompany.com/files/HOYFrevisedMcBrayer.pdf
Period eyewear is always a problem to locate but this article will give you information you can use. This company looks like they have good recreations of period eyewear.