* Long eyelashes: These act like a natural barrier, deflecting sand away from the eye.
* Third eyelid: This transparent membrane, called a nictitating membrane, can slide across the eye to provide additional protection. It also helps to keep the eye moist and clean.
* Eyelid shape: The eyelids of camels are slanted downwards, which further helps to direct sand away from the eye.
* Eyebrow ridge: The brow ridge above the eyes helps to deflect sand upwards.
* Tear ducts: These produce a thick, oily tear that helps to lubricate the eye and trap sand particles.
All these features combined help camels navigate harsh desert environments where sandstorms are common.