Human Eye Anatomy and Function

The video explains how objects are visible due to light reflection. It covers the human eye's anatomy, including the cornea, iris, pupil, lens, and retina, and their roles in vision. The cornea protects the eye, the iris controls light entry, the lens focuses light, and the retina processes visual information. The video concludes with a recap of these concepts.

What is the primary reason objects are visible to us?

• They reflect light into our eyes.

• They emit their own light.

• They absorb all light.

• They are transparent.

What is the main function of the cornea?

• To focus light on the retina.

• To change the color of the eye.

• To protect the eye and allow light to pass through.

• To control the amount of light entering the eye.

Which part of the eye determines its color?

• Cornea

• Lens

• Iris

• Retina

How does the iris control the amount of light entering the eye?

• By moving the retina.

• By opening and closing the cornea.

• By changing the shape of the lens.

• By enlarging or shrinking the pupil.

What happens to the iris in low light conditions?

• It becomes opaque.

• It expands to let in more light.

• It shrinks to let in less light.

• It changes color.

What type of lens is found in the human eye?

• Bifocal lens

• Convex lens

• Concave lens

• Flat lens

Where does the lens focus light in a normal eye?

• On the cornea

• In front of the retina

• Behind the retina

• On the retina

What are the two types of nerve cells found in the retina?

• Cones and cylinders

• Cylinders and spheres

• Rods and spheres

• Rods and cones

Which nerve cells in the retina are sensitive to bright light?

• Neither rods nor cones

• Both rods and cones

• Cones

• Rods

What is the role of the optic nerve?

• To change the shape of the lens

• To focus light on the retina

• To control the size of the pupil

• To transmit visual information to the brain