"Wear sunglasses labeled “100% UV protection": Use only glasses that block both UV-A and UV-B rays and that are labeled either UV400 or 100% UV protection.
Choose wraparound styles so that the sun's rays can't enter from the side.
If you wear UV-blocking contact lenses, you'll still need sunglasses.
Wear a hat along with your sunglasses; broad-brimmed hats are best.
Remember the kids: It’s best to keep children out of direct sunlight during the middle of the day. Make sure they wear sunglasses and hats whenever they are in the sun.
Know that clouds don’t block UV light: The sun’s rays can pass through haze and clouds. Sun damage to the eyes can occur any time of year, not just in summer.
Be extra careful in UV-intense conditions: Sunlight is strongest mid-day to early afternoon, at higher altitudes, and when reflected off of water, ice or snow."
https://www.aao.org/eye-health/tips-prevention/summer-sun-eye-safety - Be sure to check this out. They have wonderful information on UV rays and your eyes, how to choose the best sunglasses, etc.