It's affordable for most of us to spend 20 bucks to buy a pair of glasses,but some glasses brand such as Baodao（formosa-optical）, it sells glasses too expensive

It's affordable for most of us to spend 20 bucks to buy a pair of glasses,but some glasses brand such as Baodao（formosa-optical）, it sells glasses too expensive,maybe we have to pay a few hundred dollars for a pair in mainland China.