In Queensland, Australia, a skin cancer expert conducts daily examinations of patients' eyelids and the skin around their eyes, as these areas are prone to ultraviolet damage. Meanwhile, in a technology company laboratory in California, engineers are testing smart lenses that can filter out digital blue light. The science of choosing sunglasses has never been as complex and crucial as it is today - it is no longer just a fashion accessory, but the first line of defense for protecting eye health, and even a lifestyle choice in the digital age.