Sorry, I've no attention of upsetting you Nishy.
That looks a professional site, but when you look into it, there's no address for the seller which rings alarm bells for me, so I did a search.
http://www.scamadviser.com/is-goodsdetails.com-a-fake-site.html
Looks like they are in China and the security of the site doesn't look that hot too. Now I love a bargain but I wouldn't personally risk this place with my credit card details or my eyes on fakes. If you have any family history of cataracts then protecting your eyes from the sun is essential. My grandparents and my father both had cataracts and I've the start of one in one eye, my optician advised me to always wear good quality sunglasses.