I couldn't find this mentioned on HUKD,although someone advertised their voucher.
Basically you can get glasses which you would pay £30-£99 for in famous companies like Specsavers for only £15. Also I found a 15% off voucher on HUKD but I am not sure if it still works.
The owner of the company is a 21 year old entrepreneur who realised that infact famous glasses companies are putting high prices on their glasses to increase profits when actually glasses include as much metal as a spoon. He has saved many people millions of pounds by selling the EXACT SAME glasses for much cheaper, and in the process he has become an millionaire himself.