Sunglasses aren’t just for style — they also help protect your eyes and keep your vision healthy over time. In this blog, we’ll explore the main reasons for wearing sunglasses and offer practical tips on how to choose the right pair for your needs.
Table of Contents
Why Should You Wear Sunglasses?
1. Effective UV Protection
Ultraviolet (UV) rays are invisible and present all around us. They come in three types: UVA, UVB, and UVC. Prolonged exposure can lead to skin damage, such as tanning and premature aging, but more importantly, UV rays penetrate the eyes and may increase the risk of serious eye conditions like cataracts and macular degeneration. Good sunglasses block these harmful rays and help protect your eyes.
2. Reduces Glare and Visible Light Intensity
When your eyes are constantly exposed to bright sunlight, it can cause eye strain, discomfort, and even symptoms like headaches, eye pain, and blurred vision. Over time, strong light exposure can contribute to retina and cornea damage. Wearing sunglasses helps reduce glare, so your eyes feel more relaxed and protected when you’re outside.
3. Shield Eyes from Airborne Irritants
Sunglasses can also help keep out dust, pollen, and wind. This helps protect your eyes from irritation, dryness, and potential infections, especially in urban or high-pollution areas.
What to Look for When Choosing Sunglasses
1. Understanding Lens Categories
You might notice sunglasses labeled as Category 1, 2, 3, or 4 — these refer to the lens’ visible light transmission (VLT):
| Category | Tint Level | VLT Range | Recommended Use | Suitable for Driving? |
| Category 1 | Very Light Tint | 43%–80% | Fashion or indoor use | ✔ Yes |
| Category 2 | Light to Medium Tint | 18%–43% | Daily outdoor wear | ✔ Yes |
| Category 3 | Dark Tint | 8%–18% | Beach, sports, general sun use | ✔ Yes |
| Category 4 | Very Dark Tint | 3%–8% | High-altitude, intense sunlight | ✘ No |
Note: VLT means the percentage of light that passes through the lens. Lower VLT = darker lens.
2. Check UV Protection Labels
Reliable sunglasses usually display one of the following labels:
UV400: Blocks all UV rays below 400nm; lens transmits less than 2% of UV light.
UV Protection / Anti-UV: Blocks UV rays below 380nm; also transmits less than 2% UV.
100% UV Absorption: Offers full UV protection across the entire UV spectrum; lens transmits less than 0.5% UV light.
Make sure the pair you pick clearly shows UV protection standards.
3. Choosing the Right Lens Color
Dark lenses aren’t always the best choice — each color has its own use:
Gray lenses: Neutral and versatile; maintain true color balance.
Brown lenses: Block up to 98% of UV rays; improve clarity in polluted or hazy conditions.
Green lenses: Reduce glare and enhance contrast; great for those prone to eye fatigue.
Yellow lenses: Improve visibility in fog or low-light; not ideal for driving as they can distort traffic signal colors.
Red/Blue lenses: Primarily decorative; best used for fashion rather than function.
4. Lens Material Matters
Different lens materials have different benefits:
Glass lenses: High optical clarity, scratch-resistant, heavier.
Resin lenses: Lightweight, good optical performance, heat-resistant, easy to tint.
Nylon lenses: Durable, impact-resistant, excellent clarity, lightweight.
Polycarbonate lenses: Lightweight, impact-resistant, affordable, good tint retention.
Final Thoughts
Sunglasses help you see comfortably and protect your eyes — a small step that goes a long way. Whether you’re heading to the beach, driving, or simply walking outdoors, choosing the right sunglasses makes a big difference. Look for good UV protection and a comfortable fit first, and with so many styles out there, you’ll still find a pair that looks great too.
Need help finding the perfect sunglasses for your market or retail line? MingHang Eyewear can help you create sunglasses that match your brand. Get in touch to check out our latest designs.
