UV Protection Sunglasses: How to Choose the Right Lenses to Protect Your Eyes (2026)
With the arrival of good weather, sunglasses become an essential accessory. But not all glasses protect equally: choosing the right lenses is crucial for your eye health. In this guide, we explain everything you need to know about UV protection and how to choose sunglasses that are truly effective.
Why is UV protection so important?
Ultraviolet (UV) rays emitted by the sun are invisible, but they can cause serious and cumulative damage to the eyes. Prolonged exposure without adequate protection is associated with several eye conditions:
- Cataracts: The clouding of the lens, the leading cause of reversible blindness worldwide, is accelerated by UV exposure.
- Macular degeneration: UV rays contribute to the deterioration of the macula, the central part of the retina responsible for sharp vision.
- Pterygium: An abnormal growth of the conjunctiva that can invade the cornea, common in those who spend a lot of time outdoors without protection.
- Photokeratitis: A kind of "sunburn" of the cornea, painful and debilitating, caused by intense UV exposure.
What many don't know is that dark lenses without a UV filter are more dangerous than not wearing glasses: the pupil dilates behind the dark lens, allowing more radiation to reach the retina.
UVA, UVB, and UV400: what do they mean?
To make an informed choice, it's helpful to understand the different types of ultraviolet radiation:
- UVA (315-400 nm): Penetrate deep into the eye, reaching the lens and retina. They are present all year round, even on cloudy days.
- UVB (280-315 nm): More energetic, they are mainly absorbed by the cornea and lens. They are the main cause of photokeratitis.
- UV400: This designation indicates that the lenses block all radiation with a wavelength up to 400 nanometers, covering 100% of UVA and UVB. It is the protection standard recommended by ophthalmologists.
When buying sunglasses, always look for the CE mark (European conformity) and the label UV400 or "100% UV protection". Be wary of cheap glasses without these certifications.
Filter categories: from 0 to 4
Sunglasses lenses are classified based on the percentage of visible light they let through:
| Category | Light transmission | Recommended use |
|---|---|---|
| 0 | 80-100% | Indoors, overcast sky |
| 1 | 43-80% | Dim sunlight |
| 2 | 18-43% | Average sunlight |
| 3 | 8-18% | Intense sunlight (everyday summer use) |
| 4 | 3-8% | Extreme light (high mountains, glaciers — not for driving) |
For everyday use in Italy, category 3 is the ideal choice for most summer situations.
Please note: the filter category indicates how much visible light is blocked, not the level of UV protection. A category 1 lens can have full UV400 protection, as can a category 4 lens.
Lens color: it's not just aesthetics
The color of the lenses influences visual perception and comfort:
- Brown/Amber: Increases contrast, ideal for driving and outdoor activities. Recommended for myopic individuals.
- Grey: Reproduces natural colors without altering them. Versatile and suitable for all situations.
- Green: Good balance between contrast and color fidelity. Traditionally used in high-quality lenses.
- Yellow/Orange: Maximum contrast in low light conditions. Ideal for sports and night driving, but not as sun protection.
- Blue/Violet: Aesthetic trend, but with less balanced optical properties.
In our artisan workshop in Florence, we often recommend lenses in brown and green tones for our sunglasses: they offer the best compromise between protection, visual comfort, and aesthetic appeal with acetate frames.
Polarized lenses: when are they really needed?
Polarized lenses contain a special filter that blocks reflected light (the so-called "glare") from surfaces such as water, snow, wet asphalt, and glass.
Advantages:
- Eliminate annoying reflections
- Improve contrast and sharpness
- Reduce eye strain
When they are particularly useful:
- Driving (reduce glare from asphalt and dashboards)
- Water sports and fishing
- Skiing and mountain activities
- City walks on bright days
Limitation: they can make it difficult to read LCD screens (smartphones, navigators, digital dashboards) at certain angles.
The frame matters: side protection too
Complete UV protection does not depend solely on the lenses. The frame plays an important role:
- Wraparound frames or large-sized frames also protect against light entering from the sides.
- UV rays reflected from surrounding surfaces can reach the eyes from the sides and bottom.
- For prolonged outdoor activities, choose frames that cover the periocular area well.
Our artisan glasses made of Italian acetate offer frames with a classic design but with proportions designed to ensure optimal coverage, combining protection and style.
Year-round UV protection: not just in summer
A common mistake is to think that sunglasses are only needed in summer. In reality:
- UV rays are present all year round, even in winter
- Clouds only partially filter UV rays: up to 89% of radiation can pass through cloud cover
- Snow reflects up to 80% of UV rays (compared to 10-25% for sand)
- In the mountains, UV intensity increases by 10-12% for every 1,000 meters of altitude
How to recognize quality sunglasses
Here's a checklist for your next purchase:
The artisan choice: quality without compromise
In our workshop in Florence, every pair of Antica Occhialeria sunglasses is handmade with certified UV400 category 3 lenses and frames made of Italian cellulose acetate. The difference is visible — and felt — from the very first use.
Discover our collection of artisan sunglasses on anticaocchialeria.com.
Do you have questions about choosing the right lenses for you? Come visit us in our store in Florence or contact us: we will be happy to advise you.
