{
  "Frame again": "Photochromic lens frames are frames that have lenses that change color depending on the amount of ultraviolet (UV) light they are exposed to. They are also known as light-responsive, adaptive, or transition lenses. They are designed to provide both the vision correction of prescription glasses and the UV protection of sunglasses without needing to switch frames.\n\nPhotochromic lenses work by using light-sensitive molecules that change their structure when they absorb UV rays. This causes them to darken and block more light. When the UV light is reduced, the molecules return to their original state and the lenses become clear again. The process is reversible and can happen many times.\n\nPhotochromic lenses have many benefits, such as:\n\nThey can reduce eye strain and fatigue by adjusting to different light conditions.\nThey can protect the eyes from harmful UV rays that can cause cataracts, macular degeneration, and other eye diseases.\nThey can save money and space by eliminating the need for separate glasses and sunglasses.\nThey can enhance the appearance and style of the frames by offering various colors and tints.",
  "Lens": "Photochromic lenses also have some drawbacks, such as:\n\nThey may not darken enough in very hot or cold temperatures, or inside a car with tinted windows, because the UV light is blocked or reduced.\nThey may take some time to change from dark to clear, especially in cold weather, which can affect the vision in changing environments.\nThey may not be suitable for some activities or occupations that require precise color perception, such as photography, painting, or aviation."
}