19-4 Seeing Light

Front

What is the optic nerve?

Back

The optic nerve is a short, thick nerve that carries signals from the rods and cones in the retina to the brain.

Front

What are rods?

Back

Rods are cells in the retina that respond to small amounts of light, allowing us to see in low-light conditions.

Front

What are cones?

Back

Cones are cells in the retina that respond to color and are responsible for our ability to see fine details.

Front

What is the retina?

Back

The retina is the layer of cells that lines the inside of the eyeball, containing rods and cones that detect light.

Front

What is the pupil?

Back

The pupil is the opening in the center of the iris that allows light to enter the eye.

Front

What is the function of the cornea?

Back

The cornea is the clear, dome-shaped surface that covers the front of the eye and helps to focus light.

Front

What is the lens of the eye?

Back

The lens is a transparent structure behind the pupil that changes shape to help focus light onto the retina.

Front

What is the iris?

Back

The iris is the colored part of the eye that controls the size of the pupil and the amount of light entering the eye.

Front

What is the difference between rods and cones?

Back

Rods are sensitive to light and help us see in dim conditions, while cones are sensitive to color and detail.

Front

What role does the retina play in vision?

Back

The retina converts light into electrical signals that are sent to the brain via the optic nerve.