Understanding the American Optical Cool Blue Welding Lens Overview of American Optical American Optical (AO) is a renowned brand with a rich history dating back to 1833. Known for their precision and innovation in optical technology, AO has been a pioneer in developing high-quality protective eyewear. Their commitment to safety, durability, and … [Read more...] about The Ultimate Guide to American Optical Cool Blue Welding Lens: Features, Benefits, and User Tips