The US Food and Drug Administration (FDA) has just approved an unusual blend of sunglasses and contact lenses: Light-sensitive contacts darken when in contact with the sun, allowing you to wear sunglasses when you are outside.
They can quickly switch to near-black people under normal contact, and Johnson & Johnson claims that they can switch fast enough so you don’t have to worry about going into the wall because you can’t see the moment you walk in the sun.
The lens itself contains a dynamic photochromic filter that is filled with photochromic molecules that change its structure when exposed to ultraviolet light, and also blocks blue light.
This technology has been in eyeglasses for a long time (as early as the 1960s), but no one has integrated it into contact lenses. People have to wonder how much it is necessary, but there are some additional conveniences.
Now, the U.S. Food and Drug Administration has invested in its support and it is expected that these lenses will begin to be sold in the first half of 2019.
Currently, they only take 2 weeks to be replaced, but like any contact, they may change prescriptions.
They are a strange idea, but if the FDA approves them, it means that nothing has crashed because of impaired vision. This may be what most people worry about.