How Glass Lenses Are Made

ProcessX takes us inside Ohara, a Japanese company that makes precise, light-focusing lenses. They start by melting silica and other materials in a furnace, casting it, crushing the glass into shards, then remelting it to get the desired refractive value. After that, the glass bars are cut, cooled, and polished to make finished lenses. Turn captions on for a more details.