An upper lid, lower lid, and a third eyelid called the nictitating membrane.
This third eyelid is a translucent membrane that sweeps across the eye horizontally, providing a protective shield against blowing desert sand and dust while still allowing some visibility.
The upper and lower eyelids have long, curly eyelashes that also help keep sand away from the eyes.
Additionally,
the nictitating membrane acts like natural sunglasses by filtering sunlight and reducing glare,
which is essential for protection in the bright desert environment.
Together, these eyelids form a sophisticated defense system that protects the camel's eyes from harsh desert conditions,
enabling camels to see clearly even during sandstorms.