Camels have a third eyelid that goes from side to side that protects the eyes against sand and wind. In case, sand goes enters their eye, the third eyelid can remove it. The camels can also see through the eyelid.
Camels are domesticated animals that are useful in many countries for travel, meat and even milk. Today, there are two surviving Camel genus, dromedary, or one-humped camel (C. dromedarius), which inhabits the Middle East and the Horn of Africa; and the bactrian, or two-humped camel (C. bactrianus), which inhabits Central Asia.
Camels are prominently known for travelling in desert areas because of their ability to survive on little to no food for long periods of time. When travelling these areas, the most common hazard that they come across are sandstorms.These powerful sandstorms make it difficult to travel.
Camels have another advantage in this area, a third eyelid –scientifically known as nictitating membrane. Camels aren’t the only ones that have this membrane. Other creatures such as dogs, cats, some reptiles, birds, sharks and a small amount of mammals also have this third eyelid.
This eyelid provides extra protection against winds, sand and other dirt. It also lactates providing moisture for the eyes. Camels also have long eyelashes that keep much of the sand out, but in case of sand entering the eye, the camel can use the third eyelid to remove the sand. This eyelid is also transparent so that camels can have visibility through a sandstorm or a windstorm.