What's the difference between panoramic color-changing glasses and other brands? Why is it so expensive?

Full line of sight specializes in glasses color-changing technology, and its patented color-changing coating is now the sixth generation product. Full line of sight is the most advanced lens color change technology. Almost all well-known brands of color-changing lenses adopt full line-of-sight technology, such as Essilor, Nikon, Hoya, Zeiss and so on. These brands of color-changing lenses are all full-line-of-sight and color-changing films, and the lenses with full-line-of-sight color-changing films will have full-line-of-sight signs in packaging and publicity. Omni-vision also has its own brand of color-changing lenses, but because Omni-vision only studies color-changing technology, Omni-vision color-changing lenses are the best among the color-changing lens brands, which can block 100% ultraviolet rays and reduce glare. It is also the official designated glasses brand of the National Golf Tour, and its quality is relatively more guaranteed, so it is also more expensive.