Style and health awareness smartly frame eyewear boom

Stores are expected to double to 120,000 by 2021, spawning a 1 trillion yuan market

Li Rongnan, 36, a Shanghai-based corporate legal affairs consultant, bought three pairs of glasses on a weekend this scorching summer.

"One for driving, one for swimming, and one for playing tennis," said Li, adding that various situations in life demand matching eyewear.