You might have heard about the “UV400” term if you have ever browsed the internet about sunglasses. UV400 sunglasses are a mandatory term you should be aware of, especially in tropical climate settings. In this blog, we aim to explain the depth of UV400 sunglasses, how they work, and common questions related to the term.
What is UV400
UV400 simply means these lenses block 99% to 100% of both UVA and UVB rays from reaching your eyes. This is considered the golden standard of eye protection and offers the highest level of protection eyewear can give in the market. As exposure to UVA rays penetrates deep into the skin, it primarily causes aging and wrinkles. UVB rays affect the skin's surface and are the primary cause of sunburns. UV400 sunglasses are considered a great choice to safeguard from them, especially if you are planning to invest in long-term safety.
The Science Behind UV400 Lenses and How it Works
Before we dive into the actual science of the UV400 lenses, you need to have a good idea about the aspects below. Understanding exactly what these mean will help you protect your vision:
The Spectrum
Ultraviolet (UV) light is measured in nanometers (nm). In the nanometer spectrum, UVA rays fall in the range of 315–400 nm and UVB rays in the range of 280–315 nm. Exposure to these rays can cause serious conditions over time, such as cataracts and snow blindness.
UV400 sunglasses are able to block almost all of these two types of rays. These lenses can block wavelengths up to 400 nanometers, making them highly effective against long-term sun exposure.
Darkness Does not Equal Safety
Many Sri Lankans have the misconception that the darker the lens of your sunglasses, the safer your eyes are. However, the tint of a lens only dictates how much visible light is blocked. It has no impact on actual protection from UV radiation. A dark lens without UV protection is actually worse than no sunglasses. It can force your pupils to dilate in the dark, letting more harmful UV rays flood into your eyes.
UV400 vs Polarisation
When we talk about UV protection, another common term that comes into the topic is polarisation. Although these two are commonly associated, they do completely different things.
UV400 lenses block invisible and harmful radiation from the sun. What polarised lenses do is it cuts the harsh glare caused by the reflection of strong sunlight. UV400 is about protection, and polarised lenses are about comfort.
Some Other Common Questions Asked about UV400 Sunglasses
Do I need to wear UV400 sunglasses on cloudy days?
Yes. Up to 80% to 90% of the sun's UV rays can penetrate through cloud cover, even though you cannot see them. So, you should wear UV400 sunglasses to keep your eyes protected even when the sun isn't directly shining.
Is 100% UV Protection and UV400 the same thing?
In modern times, both UV400 and 100% UV protection are both used interchangeably. But, it is safe to always choose the specific UV400 label or 100% UV protection up to 400nm, or vague "UV Protection" claims.
How can I test if my glasses are UV400?
Yes. You can get your sunglass choice tested and verified with UV meters right at stores like Vision Care. If you have a black light (UV flashlight) and a banknote, you can also test them at home.
In Conclusion
When it comes to your eyes, guessing isn't good enough. Wearing UV 400 sunglasses is your ultimate shield. Keep the above tips and insights in mind and choose a reliable optical provider in Sri Lanka for your purchase. Ensure you are fully protected by shopping UV400 sunglasses online at Polar Sun.
