Do you remember the first time you saw someone wearing transition lenses? Probably not, but surely you can understand how that first sighting might make someone think the glasses were magic! After all, transition lenses are able to shift from clear indoor-appropriate lenses to tinted sunglasses when exposed to sunlight — and without any help from the person wearing them! They’re incredibly convenient, but also somewhat mysterious to the average consumer. So, how do transition lenses work?
The Magic of Transition Lenses
Transition lenses, also known as photochromic lenses, are eyeglass lenses that automatically darken in response to sunlight and become clear again when you step outdoors.
So, how do transition lenses work? Their adaptability is made possible by a special lens material containing photochromic molecules that undergo a chemical reaction when exposed to ultraviolet (UV) light. These molecules are typically embedded within the lens material. When you step outside, they absorb UV light, which triggers a chemical reaction that causes them to change their structure, resulting in a darker lens. This reduces glare and helps protect your eyes from harmful UV radiation. Then, when you move indoors again, the photochromic molecules gradually revert to their original state, causing the lens to become clear again. It’s not magic — it’s science!
How long does it take?
This is one of the misconceptions regarding transition lenses. They don’t change instantly. Typically, it takes a few minutes for the lenses to go from tinted to clear. The darkening process is a bit quicker, taking around 30 seconds.
What are the benefits?
Transition lenses are a great option if you find yourself frequently switching between eyeglasses and prescription sunglasses. They’re also fantastic if you wear glasses but don’t have prescription sunglasses. They’re exceptionally convenient and help protect your eyes from dangerous UV rays. Plus, if you’re someone who frequently loses their sunglasses, you’re far less likely to do so with transition lenses because they can stay on your face all day!
What are the drawbacks?
You don’t control the lenses; the sun does. So, if you’re outside on a sunny day wearing your transition lenses, you will automatically have tinted lenses. In addition, you might find the transition a little slow — especially in winter, when cold temperatures can impact the rate of transition. Finally, some brands don’t work as well in cars because most windshields are designed to block UV light.
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So, how do transition lenses work? They use photochromic technology to quickly adapt to their environment. They’re an ideal option if you wear eyeglasses regularly and don’t want to worry about buying prescription sunglasses, wearing sunglasses on top of your glasses, or fussing with clip-on sunglasses.
If you’re considering buying transition lenses, be sure to check out our blog post Pros and Cons of Transition Lenses to more fully explore why you may — or may not — fall in love with this amazing optical technology.
Are you looking for an optometrist in southwest Missouri? Visit one of our experienced optometrists at Heffington’s. Since 1975, the Heffington family has been assisting the Springfield community with top-quality eye care and affordable eyeglasses and contacts. One of the unique features of our family-owned business is that we manufacture lenses at our own laboratory, giving us total control over the service and pricing, and we’re happy to pass our savings on to you. To learn more about our products and services, please get in touch with us online, send an e-mail to asktheexperts@heffingtons.com, or give us a call at 417-869-3937 (Optiland location) or 417-882-3937 (House of Vision location). We look forward to hearing from you!
P.S. If you sometimes get transition lenses confused with progressives, you’re not alone! Learn the difference between progressive and transition lenses.