One of the causes of some of the most serious eye diseases is: ultraviolet light. Depending on the frequency and wavelength, ultraviolet light is divided into two categories: ultraviolet A and ultraviolet B.
As a natural eye protection mechanism, the cornea of the eye absorbs all UVB and most of the UVA. However, there is still a portion of the ultraviolet A that will reach the lens of the eye. Long-term absorption of UVA may cause cataracts, and a small amount of UVA that passes through the cornea to the retina can cause macular degeneration, which is the leading cause of blindness in the elderly over 65 years of age. Prolonged exposure to intense UV light can cause cancer in the eye or actinic keratitis, which is the burn of the retina. This is often the case when it is sunny outdoors after snowing in winter, and the snow surface reflects the sun glare, which is often referred to as snow blindness.
Sunglasses have a good UV-blocking coating that eliminates UV radiation, so you must ensure that your sunglasses filter 100% of the UV rays. The label on the sunglasses should indicate what level of UV protection the sunglasses provide, and what you need is 100% protection.