* Ideally, your sunglasses should wrap all the way around your temples, so the sun's rays can't enter from the side.

* In addition to the sunglasses, it is recommended to wear a broad-rimmed hat to protect your eyes. Don't be fooled by a cloudy day. The sun's rays can pass through the haze and thin clouds.

* Even if you wear contacts with UV protection, don't forget your sunglasses.

* It's especially important to wear sunglasses in the early afternoon, when UV light is most intense, and in higher altitudes where UV light is more intense.