Photochromic lenses darken to a sunglasses tint when exposed to sunlight, or UV ultraviolet, and return to a clear state when indoors, away from UV light.
Often referred to as transitions or react to lights, photochromic lenses are made of many lens materials including plastic, glass or polycarbonate. They are typically used as sunglasses that
conveniently switch from a clear lens indoors to a sunglass’s depth tint when outdoors.
They typically take around 30 seconds to fully darken and between two to five minutes to return to a clear state.
Tiny molecules of silver halide and chloride are embedded within a photochromic lens which is invisible and clear until exposed to sunlight/UV rays.
A chemical process takes place when exposed to sunlight/UV and the molecules effectively move, change shape and absorb the light. This process changes the molecules and they darken to a sunglasses shade/tint.
The photochromic lens will remain in this 'darkened' sunglasses state whilst exposed to sunlight/UV and the molecules will reverse the process once the lenses are removed from the sunlight/UV rays returning to the original 'transparent/clear' lens.
photochromic
Change Color
How Long Do Photochromic
Lenses Take To Change Color or React?
When exposed to sunlight/UV rays, photochromic lenses will take around a minute to darken and will continue to darken for a further 10 minutes, resulting in a full sunglasses tint/shade.
Digital devices are changing our world. We are abundantly surrounded by technology & digital displays emitting harmful blue light which makes us highly susceptible to Computer Vision Syndrome (CVS). Over a period of time, with continuous focusing and refocusing of the eyes, this can result in symptoms like dry eyes, headache & eye strain.
Whether you’re at work with your laptops or are scrolling social media posts on your smartphones, it is always suggested to wear eyewear with blue-light blocker lenses. Blue Light Blocker Lenses are a perfect go-to solution to enjoy your screen-time to the fullest.
blu-shieldz® faq's
Absolutely. Kids today are spending more time online than in the past due to more emphasis on online classes and assignments. Also, since their eyes are much more delicate than adults, they are more prone to CVS. Which is why, Blue Light Blocker/Blue Cut Eyeglasses are a must for children.
Yes. As even though we might work on laptops and computers only during fixed hours, we keep checking pop ups and notifications on our smartphones every once. Smartphone too emit blue light – and so, here’s another reason to keep these glasses on your eyes.
Yes. Even little hours can affect our vision in the long run. Also, laptops or digital devices are not the only source of bad blue light. Sunlight is the main source followed by many LED-based light bulbs, televisions etc. can also affect our vision. So, wearing anti-blue glasses is a wise choice to keep eyes protected.
No. Blue light helps to regulate our sleep-wake cycle so it’s not completely harmful. In fact, we do need certain amount of blue light in a regulated manner to stay alert & focus better. We, however, have to limit its absorption and prevent over exposure. With such technological advancements that we are encircled with today, it becomes quite a challenge to maintain the balance. This is where Blue light blocker lenses come into play.
Yes. Along with wearing your blue light glasses, you can adjust screen brightness, stay hydrated and practice 20-20-20 rule for better vision acuity.
A slight amber/yellow tint on the lenses is completely normal. Since blue light blocking lenses absorb high energy Blue Light, a slight yellowish tint develops on the lenses over time.
Don’t worry. This will not affect the efficiency of the lenses at all, rather, it is considered a great sign that your glasses are actually working.
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