What Are Tears?
What Are Tears? Tears are made of salt water, as you will know if you have ever licked a finger after wiping them away. They happen when the gland which provides...
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What Is a Squint?
What Is a Squint? A squint, or strabismus, is the name given to a condition in which both eyes do not point in the same direction. Whilst one eye looks straight ahead,...
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What Are Our Eyes Made Of?
What Are Our Eyes Made Of? The outer shell of the eyeball is made up of three coats: the fibrous tunic, composes of the cornea and sclera. The middle layer, known as...
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How Many Eyelids Does a Camel Have?
How Many Eyelids Does a Camel Have? A camel’s large, dark eyes are protected by three eyelids. The two outer eyelids have long, thick eyelashes that protect the...
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Do Birds Have a Third Eyelid?
Do Birds Have a Third Eyelid? Birds have a special “third eyelid” in the corner of each eye close to the beak. This extra eyelid is called the nictitating...
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