Filtering ultraviolet rays
The ultraviolet (UV) radiation of the sun causes human cataracts, pterygium, eyelid skin cancer, and electro-optic ophthalmia (also known as snow blindness, which is corneal damage). The wide-brimmed hat can only block 50% of the ultraviolet rays that reach the eye, so you also need to wear sunglasses.
Filter blue light
Long-term exposure to ultraviolet light and short-wavelength blue light is a risk factor for age-related age-related macular degeneration (AMD). (Age-related macular degeneration, European prevalence rate 12.3%, Asian prevalence rate 7.4%, Wan Ling Wong, Lancet Global Health, 2014)
Comfortable visual experience
Bright and glaring sun can make the eyes uncomfortable, affecting the clarity of the object, and people will blink and cry.
Enhance dark adaptation
After 2-3 hours in bright sunlight, people's adaptability to indoor lighting and nighttime will be reduced, making night driving more dangerous.