When we think of blue light, blue light-blocking eyeglasses often come to mind—not sunglasses. But can sunglasses also filter blue light? And what if you need protection from both screen exposure and sunlight at the same time?

In this blog, we'll explore everything you need to know about blue light filtering in sunglasses and how to choose the right option for your needs.

1. What Is blue light?
2. Can sunglasses also filter blue light?
3. Which kind of sunglasses you can use to block blue light?
4. How to rest your eyes if you only have regular sunglasses?

1. What Is blue light?

Blue light is a type of high-energy visible (HEV) light with short wavelengths that penetrate deep into the eye. While natural blue light from the sun helps regulate sleep and mood, too much exposure can lead to:

• Digital eye strain (from excessive screen use);
• Increased risk of macular degeneration;
• Disrupted sleep cycles;
• Glare-related discomfort;
• Headaches, and neck and shoulder pain. 

This is why many people use blue light blocking glasses for screen time. But what about when you're outdoors?

2. Can sunglasses also filter blue light?

Sunglasses are mostly used to protect your eyes from harmful UV rays, and block wind, dust in the air, some blue light outdoors. But for blue light from digital screens, not all sunglasses can effectively block it.

If you have such need, consider yellowish tint sunglasses like: dark amber, orange, copper or brown. These colors work to filter blue light and heighten contrast, making them great for indoor and outdoor activities. 

3. Which kind of sunglasses you can use to block blue light?

• Blue Light Blocking Sunglasses – Specifically designed with coatings to filter blue light.
• Amber or Brown-Tinted Lenses – Naturally reduce blue light exposure and improve contrast.
• Photochromic Lenses – These adjust to different light levels and provide blue light filtering indoors and outdoors.
• Polarized Sunglasses with Blue Light Protection – While standard polarized lenses don’t block blue light, some models come with a blue light filter.

4. How to rest your eyes if you only have regular sunglasses?

Under these conditions, you may follow the 20-20-20 rule: take a 20-second break every 20 minutes to look at something 20 feet away. This simple habit helps reduce eye strain and gives your eyes much-needed rest during long screen sessions.