As professionals in the optical lens industry, we all know that common progressive lens corridor include 12+2, 12+4, and 9+4. But do you know which corridor is best for your users? This article will provide a detailed introduction from the perspective of Chinese lens manufacturers to help optical lens distributors, wholesalers, and opticians make the … Continue reading Which progressive lens corridor should I choose: 9+4, 12+2, or 12+4?