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With a lot of the online glasses stores having Fourth of July sales, it's a good time to pick up a pair.

Executive Editor David Carnoy has been a leading member of CNET's Reviews team since 2000. He covers the gamut of gadgets and is a notable e-reader and e-publishing expert. He's also the author of the novels Knife Music, The Big Exit and Lucidity. All the titles are available as Kindle, iBooks and Nook e-books, as well as audiobooks.

If you're looking for a new pair of prescription glasses or contacts, there are plenty of deals to be had as most online glasses sites are offering up Fourth of July sales this weekend. GlassesUSA , one of the retailers on our best places to buy glasses online list, has some decent deals running through July 5 that are a little sweeter than the deals it usually offers. (Yes, online glasses sites are perpetually advertising discounts and GlassesUSA has had similar "special" sales in the past .)

As part of the sale, you can get prescription glasses for less than $40 with basic lenses, but if you opt for some of the lens upgrades, your total gets pushed up to anywhere from about $70 to $120. Exclusions apply and you have to enter the codes listed below at checkout. 

Read more: Best Places to Buy Glasses Online