[Photo provided to China Daily]

"We make the frame wider as Asian people tend to have a wider face," she says. "Also, because people in Europe have a high nose, we make the nose pad a little bit lower so as to fit an Asian face."

Esto has been surprised by the attitudes to fashion she has found in China.

"There are a lot of girls who wear glasses without lenses, just for fashion.

Also, Chinese people are not afraid of colors... My products have entered the market. I'm so happy to see they like them."

To produce yet more styles for China's fashion-conscious crowd, Esto says she plans to work with the country's fashion designers.