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Sunglasses are generally required to meet standards for UV protection, lens quality, and safety. The CE mark indicates that sunglasses meet European safety requirements, and they should also offer full UV protection up to 400nm. Additionally, good quality anti-reflection and hard coatings are recommended to enhance lens performance and durability.

Here's a more detailed look at the requirements:

1. UV Protection:

UV400:

Lenses should block UV radiation up to 400 nanometers to protect against harmful rays.

CE Mark:

The CE mark signifies that the sunglasses meet European safety standards and offer adequate UV protection.

UV Protection Labels:

Look for UV400 labels or information brochures to confirm UV protection levels.

Lens Quality:

High-quality lenses, especially those cut instead of pressed, are important for clear, distortion-free vision and to avoid eye fatigue.

2. Lens Quality and Safety:

BS EN 1836:2005: Non-prescription sunglasses should meet this British Standard.

BS EN ISO 12312-1:2013: Prescription sunglasses should comply with this standard.

Anti-Reflection Coating: A good quality anti-reflection coating can reduce glare and improve visibility.

Hard Coating: A hard coating protects the lenses from scratches and damage.

Impact Resistance: Sunglasses should be sufficiently impact resistant to protect eyes from potential injuries.

3. Driving and Peripheral Vision:

Clear Vision: Sunglasses should not be too dark, especially for driving, and should allow clear visibility.

Sufficient Light Transmission: Sunglasses should allow enough light to pass through for safe driving.

Peripheral Vision: Sunglasses with deep side arms or oversized frames can obstruct peripheral vision, which is not recommended for driving.