The Human Machine: Mystery 3

Front

What part of the eye allows light to enter?

Back

The pupil.

Front

What is the function of the retina?

Back

The retina receives light and converts it into signals that are sent to the brain.

Front

What causes the 'red eye' effect in photographs?

Back

The camera's flash lights up the blood vessels at the back of the eye.

Front

What is the role of the cornea in the eye?

Back

The cornea helps to focus light as it enters the eye.

Front

What are nocturnal animals?

Back

Nocturnal animals are those that are active during the night and sleep during the day.

Front

How do the pupils of nocturnal animals differ from those of humans?

Back

Nocturnal animals have pupils that can open really wide to let in more light.

Front

What is the iris?

Back

The iris is the colored part of the eye that controls the size of the pupil.

Front

Why do our pupils change size in different lighting conditions?

Back

Pupils change size to control the amount of light entering the eye.

Front

What is light?

Back

Light is a form of energy that allows us to see.

Front

What happens to the pupil in bright light?

Back

The pupil constricts (gets smaller) to reduce the amount of light entering the eye.