google no longer count backlinks from glasses directories because people have been submitting to every single directories, so you may see there are many pagerank decrease in many of the eyeglases related websites starting this month.
So, please do social bookmarking and search engine submission, also build up the backlinks in great PR sites.
The best way to get one way glasses links is to make your content link worthy, offer something that will make webmasters voluntarily link to you.
Providing a excellent quality glasses content has always been a great source of acquiring links and this is one of the best long term strategy that you can rely on.
Buying links are also beneficial but only if you follow these rules:
Stay under the radar (don’t buy too many links at the start, so that your website gets banned)
Make sure the link that is pointing to your glasses website looks natural. (by natural i mean the link should look as if the webmaster is pointing a resource out, just like a link you get from a blogger when he links to one of your popular topic).
Make sure the website you are buying link from is worth the price you are paying, you can check the age, .gov, .edu, .org links and the reputation it has in its niche.
Vary the glasses anchor text a lot.
Make sure you distribute links evenly to your website, just like a natural linking process is going on. Just do not keep on linking to a single page for one keyword term you want to rank for. Such as cheap glasses, prescription glasses, discount glasses.
Ask a highly trafficked blogger or webmaster to let you guest post on their site linking back to your site; ensure you put out your best content, so you have the best chance of driving targeted traffic from that link.
Ecommerce is a reasonably way too.