Whether you notice it or not, light conditions are constantly changing, sometimes more frequently than others. Photochromic is the name given to lenses which change colour depending upon the availability of UV light or visible light. The phenomenon was originally discovered in the late 1880s. These are often called transitions lenses which is just one of many brands of photochromic lenses.
Most eyewear manufacturers also have their own terms for the type of lenses, including bolle’s term ‘modulator’ or Adidas’ ‘Vario’. You will notice on the iOptix website photochromic is often referred to as Photo Brown or Photo Grey; This is a clear lens which will turn to grey or brown when subjected to levels of UV light, they will then return back to clear.
You can now also personalise your photochromic lenses from iOptix by selecting a base tint, extremely useful for sports such as golf, tennis, cycling or sailing where a base coloured lens tint is advantageous but the user would appreciate an ability for the lens to darken or change colour, this can also be applied to part of the lens (for example the top) whilst the bottom of the lens remains clear.