Bausch & Lomb.
1. Bausch & Lomb is the pioneer of contact lenses. It has a long history and a complete industrial line, but Ketang is a brand that only appeared in recent years.
2. Bausch & Lomb has more patents related to contact lenses, about 70, while Ketang only has 37 patents. To sum up, Bausch & Lomb’s contact lenses are better.