Wow, I knew the eyeglass industry had high profit margins, but I didn't expect it to be this high! A 315 investigation into just how brutal the eyeglass industry really is. Next, undercover reporting from the source of the industry to uncover the chaos in the eyeglass market. In Danyang, Asia's largest eyeglass product distribution center and known as the "Eyeglass Capital of China," reporters discovered: certain merchants are extremely cautious when discussing wholesale prices, only daring to secretly reveal information by typing on their phones.