Question

how are tears to useful to us

Answer 1

Tears are necessary to give you good vision, keep your eyes healthy and protect them from irritants.

Emotional tears – caused by strong feelings of happiness, sadness or pain – are different from the tears produced, for example, from peeling an onion, and may contain hormones and chemicals released by the body.

Crying might make your eyes red and puffy, but they won’t affect your eyesight – you can’t literally ‘cry your eyes out’!

There are three types of tear, with each containing a combination of water, fats, sugars and proteins. They all play an important role in protecting and preserving the condition of our eyes.