Sunglasses (900410) are eyewear with tinted, coated, or polarized lenses designed primarily to reduce visible light and UV exposure in outdoor use. Eyewear with clear or lightly tinted lenses designed for industrial eye protection, splash protection, or vision correction classifies under 900490 even if it incidentally blocks some UV. The primary intended function and lens specification drive the distinction.

The FDA regulates sunglasses as performance-standard products under 21 CFR Part 1040 for radiation safety, and the FTC requires accurate labeling of UV-protection claims. Prescription eyewear is regulated as a medical device. Importers should ensure lenses meet applicable radiation and impact-resistance standards and that labeling complies with FTC rules before entry.