Vision

Why does vision depend on your brain as much as your eyes? 

Light rays bounce off an object you are looking at, to your eye. Then, the light enters through the outer part of your eye , called the

• Iris

• Pupil

• Cornea

What is the dark round circle in the colored part of your eye. 

• Cornea

• Pupil

• Iris

The colored part is called the _____. It controls how wide the pupil is and how much light can pass into your eye. 

• Cornea

• Pupil

• Iris

In bright light, the Iris narrows the pupil, reducing the amount of light that enters the eye. 

In dim light, the Iris widens the pupil to let more light in. 

All of this happens _________. 

• When we think about it

• Automatically

Behind the Iris is the ____ of the eye.

• Lens

• Retina

When the lens, cornea and pupil are all working together properly, they will focus light on the back of the eye. This is important because lining the back of the eye is the _____.

• Optic nerve

• Retina

The retina helps create a rough image, but it sees the world upside down. It’s your ____ that turns what you see right side up.

• Optic Nerve

• Brain

____ are responsible for vision at low light levels (night vision)

• Rods

• Cones

are active at higher light levels (day vision)

• Rods

• Cones