Sunglasses look simple to source but hide a real compliance and quality risk: lenses that block visible light without adequately blocking UV can actually be worse for eye health than no sunglasses at all, because the pupil dilates in reduced light while UV still reaches the eye.
UV400 Protection Is Non-Negotiable
UV400 lenses block essentially all UVA and UVB radiation up to 400 nanometers. Always request UV transmittance test data for your specific lens batch — tinted lenses that merely look dark don’t guarantee UV protection, and this is one of the most common corners cut by low-cost factories to save on lens coating costs.
Lens Material Options
Polycarbonate lenses are the standard for affordable sunglasses — impact-resistant and lightweight, though prone to scratching without a hard coat. CR-39 (a plastic resin) offers better optical clarity at a higher price point but is more brittle. Polarized lenses add glare reduction, popular for driving and outdoor sport-focused product lines, and typically add $0.50-$2 per unit to factory cost depending on volume.
Import Testing Requirements
The US doesn’t have a single mandatory federal sunglasses standard, but ANSI Z80.3 is the widely referenced voluntary standard covering UV protection and impact resistance that most serious buyers require. The EU treats sunglasses as PPE (personal protective equipment) under certain conditions, which can trigger CE marking requirements depending on specific claims made.
Frequently Asked Questions
How can I verify sunglasses actually provide UV400 protection?
Request a UV transmittance test report for your specific lens formulation from a third-party lab — don’t rely on the tint darkness or a printed ‘UV400’ label alone.
Is polarization required for quality sunglasses?
No, polarization is a feature addition for glare reduction, not a safety requirement. Many quality non-polarized sunglasses still provide full UV protection.
Do sunglasses need CE marking to sell in the EU?
It depends on specific claims and use case — general fashion sunglasses often don’t require formal CE PPE certification, but confirm current requirements with a compliance consultant if marketing specific protective claims.
