Prescription sunglasses vs. transition lenses
Many people who use prescription glasses have a common worry. Is it wise to select photochromic lenses that automatically darken on their own in sunlight? Or is it preferable to alternate between sunglasses and spectacles in various situations?
The answer depends on your lifestyle. Ask yourself:
- How much time do you spend indoors or outdoors?
- Do you regularly take part in outdoor sports where protection from sun glare is important?
- Do you often misplace your sunglasses or forget to bring them with you on the go?
- Do you prefer automatic lens darkening, or do you like to switch up each of your frame styles?
Both photochromic lenses and ultraviolet (UV)-protective sunglasses offer defense against harmful UV light. Excessive UV light exposure is associated with various eye conditions. These include cataracts, photokeratitis (temporary damage to the front surface of the eye) and pterygium (“surfer’s eye”), a pinkish growth or bump on the eyeball.
Sunglasses must have a label to indicate that they block 100% of UV rays or “up to 400nm of UV absorption” to be considered fully UV-protective. A dark or tinted lens doesn’t always guarantee adequate coverage.
Learn more about the benefits of prescription sunglasses and transition eyeglasses that turn dark in the sun.
What are photochromic lenses (transition lenses)?
Photochromic lenses (also called transition lenses) are coated in a special dye that darkens when exposed to UV light from the sun. It then lightens to become clear when indoors in softer light (or at night). You may also know them by one of their popular brand names, Transitions®.
Photochromic lenses offer good visual acuity, both indoors and outdoors. When outside, they darken and reduce glare and squinting due to bright sunlight. When inside, they provide excellent clarity for the wearer.
The lenses transition from clear to tinted and return to clear in a matter of minutes. The depth of the automatic tint depends on the amount of sunlight. This means that even on a cloudy day outside, the lens will darken to some degree. Some photochromic lenses are designed to respond to all visible light, which allows them to darken inside a car when driving on a sunny day.
What are the benefits of transition lenses (photochromic sunglasses)?
There are several benefits to consider about photochromic sunglasses. They include:
One pair for indoors and outdoors
Photochromic lenses are convenient. They darken automatically when you move between indoor and outdoor settings. There’s no need to switch between eyeglasses and sunglasses — and no need to carry two sets of glasses to do so.
As a bonus, high-quality photochromic lenses also have built-in UV protection. Their 100% UVA- and UVB-protective coating shields eyes from harmful ultraviolet rays.
Blue-violet light filtering
Photochromic lenses also filter some blue-violet light. Artificial sources of indoor blue-violet light include smartphones, tablets, computers, TVs and some LED lighting. However, the main source of blue light (including blue-violet light) is sunlight, both indoors and outdoors.
Some people find that wearing glasses that filter blue-violet light makes viewing their screen more comfortable.. Every pair of Transitions® lenses is designed to help filter blue-violet light.
READ MORE: Do photochromic lenses filter blue light?
Lens tint and coating options
Another benefit of Transitions® is their customizable lenses. Both lens colors and coatings can be altered for your preferences.
Many lens tints are available in Transitions® lenses, including:
- Brown
- Grey
- Graphite green
- Green (mirrored lens)
- Blue (mirrored lens)
- Pink (mirrored lens)
- Silver (mirrored lens)
- Gold (mirrored lens)
Anti-reflective coatings can be added to help reduce eye strain during computer use. For outdoors, lenses may include mirror coatings or be polarized to minimize glare. They can be ordered in an extra dark version (called Transitions® XTRActive®), too. Those who are often outdoors or who want their lenses to tint while driving may prefer this version.
Note that the extra-dark lenses always keep a slight tint indoors. Some people love that slight tint, but others may not.
You can also get a different lens type to fit your individual needs. If you just need readers for near vision, you can get progressive Transitions® and reap all their benefits.
Photochromic contact lenses
In 2018, the first contact lenses with photochromic lenses debuted. Johnson & Johnson Vision rolled out ACUVUE OASYS with Transitions® contacts in the U.S. at that time.
Photochromic lenses allow individuals to adapt more easily to intense light exposure. They easily change back to normal light conditions afterward.
The contacts also filter blue-violet light and protect the eyes from UV rays. However, the lenses don’t provide 100% UV protection, as they don’t cover the entire eye. Be sure to wear sunglasses with adequate protection from harmful UV radiation.
Drawbacks of photochromic lenses
Though there are many benefits, there are some disadvantages of Transitions® as well. Here are some examples:
- Temperature can affect tint — Photochromic lenses are somewhat temperature dependent. It can take longer for them to adjust when it’s cold outside.
- Autoglass can interfere with lenses — Windshields and glass used for cars usually have built-in UV protection. This can prevent your photochromic lenses from darkening as they normally do.
- Overall quality may be a concern — Some transition lenses may take longer to adjust to different light. Some may not get as dark as others. This can be due to the quality of materials.
What are the benefits of prescription sunglasses?
Prescription sunglasses also have their benefits. Depending on the activity and setting they’re used for, they may be a better choice for you. Here are some benefits to consider:
How sunglasses protect eyes
Many sunglasses are crafted of light, durable polycarbonate. This material is impact-resistant and filters UV light, which can protect the wearer from injury and sun damage.
But some sunglass materials don’t provide the same protection. Be aware of the durability of your lens materials, and look for sunglasses that filter 100% of both UVA and UVB light. (They may also be labeled as UV 400.) It’s important to verify this protection before wearing your sunglasses outside.
If you’re unsure about the quality or specifications of your prescription sunglasses, speak with an optician for an expert review.
Ideal for certain activities
Prescription sunglasses are ideal if you often drive for long stretches during the day. Transition lenses aren’t as effective in the car since car windows already block out some UV rays.
They’re also great for those who participate in outdoor activities, like boating, fishing and skiing. Light is reflected off water or snow, and glare can be intense in these settings; sunglasses are a more useful option for some. Polarized prescription sunglasses can be especially helpful in these situations. Be sure they include UV protection.
Options in tints and frame styles
Darker and polarized tints are great for outdoor athletes. They’re also great for those who need to reduce the amount of glare and light reflecting off water or snow. They also help protect the eyes from excess UV light: fresh snow can reflect up to 80 to 90% of the sun’s rays, leading to additional exposure.
High altitude conditions call for sunglasses since, in general, more light and UV light penetrates the thinner atmosphere.
Another benefit of sunglasses is that frames can be designed to curve or wrap around the face. This helps reduce the amount of UV light that can enter through the sides of smaller frames and lenses. Wraparound sunglasses are recommended for the greatest protection around your eyes.
Drawbacks of prescription sunglasses
Like photochromic lenses, prescription sunglasses come with a few disadvantages. This can include:
- You need multiple frames — It can be inconvenient to continuously switch between eyeglasses and sunglasses as you move between indoor and outdoor settings. It’s also not uncommon to forget your prescription sunglasses when you leave the house.
- Expense is a factor — Prescription sunglasses can be expensive, depending on the brand of the frame and any lens features you add on. Buying prescription sunglasses is an added expense on its own if you’re also buying new glasses.
- UV-protection isn’t guaranteed — A dark lens doesn’t always have UV protection. Sunglasses should be labeled if they have 100% UVA and UVB protection.
Comparing transition lenses and prescription sunglasses
When looking at transition lenses versus sunglasses, there are a few final things to consider:
Technical specifications
Some transition lenses may take longer to darken when it’s cold out. But prescription sunglasses don’t need time to darken, which could make them a better option for cold temperatures.
Prescription sunglasses also perform better in cars, as compared to basic transition lenses. Basic transition lenses may not darken as much as you prefer behind a UV-protective windshield.
(The Transitions® brand does have a lens version called Transitions® XTRActive® that darkens well in cars.)
Cost analysis
Transition lens glasses and prescription sunglasses are close in cost on many sites. But considering that Transitions® is a “two-in-one” product, they can be less costly in the end.
Transitions® are also made with durable materials, so they’re built to last. Sunglasses can vary in quality, depending on the brand.
If your prescription changes or if your frames break, you may only need to update one pair of transition lenses. If this happens with prescription sunglasses, you’ll need to update all of your prescription eyewear.
Environmental impact
Transitions® lenses may have a smaller carbon footprint than other options because they are a two-in-one pair. With regular glasses, you also need prescription sunglasses to protect your eyes from UV radiation outdoors. Having multiple pairs of eyewear in your collection can increase your carbon footprint.
To reduce your environmental impact, opt for photochromic lenses or buy from an eyewear brand that prioritizes sustainability.
SEE RELATED: Sustainable eye care: Practices every consumer should know
Prescription sunglasses or transition lenses? You decide
Perhaps you spend equal time indoors and out. Or maybe you’re someone who drives a lot during the day. In either case, you know how valuable darkening your lenses can be. Some prefer Transitions® lenses that darken on their own. Others like to have different styles between their eyeglasses and sunglasses.
Whatever your lifestyle, the science of lenses has advanced quite far. And photochromic technology is always improving. You can easily customize your glasses to offer the best visual acuity, comfort and protection for your eyes — both indoors and outdoors.
No matter your style or preference, there’s a perfect pair out there for you. And if you prefer prescription sunglasses, there are lots of options there, too. Consult with your optician to determine the best options for your lifestyle and preferences.
