Photochromic lenses, also known as transition lenses, are eyeglass lenses that change color in response to the amount of ultraviolet (UV) light they are exposed to. They are designed to provide optimal vision in a variety of lighting conditions, from bright sunlight to overcast conditions.
When UV light is present, the photochromic molecules in the lens activate and darken the lens, providing increased protection from the sun’s harmful rays and reducing glare. As the UV light decreases, the molecules deactivate and the lens returns to its clear state, allowing for comfortable vision in lower light conditions. This transition process typically takes a few minutes to complete.
One of the main benefits of photochromic lenses is that they eliminate the need for multiple pairs of glasses. With traditional glasses, people would need to switch between a pair of clear glasses for indoor use and a pair of sunglasses for outdoor use.
What makes Photochromic lenses convenient? For starters, you only need one pair of glasses as they can be worn in all types of lighting situations.
Photochromic lenses protect you from the sun’s harmful rays, as they darken when exposed to UV light. This is especially important for people who spend a lot of time outdoors or are at a higher risk of eye conditions.
These transition lenses come in a wide range of materials, such as glass, plastic, and even polycarbonate. They can be treated to reduce glare and scratches, and they come in many types of frames, including eyeglasses, sunglasses, and even in contact lenses.
It’s important to note that photochromic lenses can be affected by certain factors like temperature, altitude, and the type of car windshield.
Nowadays, many cars have UV protection on their windshields. This can prevent the photochromic lens from transitioning. Another thing to note is the lenses may take longer to darken in extremely cold or hot temperatures, and even at high altitudes.
Please watch this short video on photochromic lenses: