The Eye

What is the primary function of the cornea in the human eye?

• To detect color changes in the environment

• To supply blood to the eye

• To refract light entering the eye

• To control the size of the pupil

Why does the cornea need to be transparent?

• To reflect light

• To absorb light

• To allow all light to pass through

• To change the light's color

What is the primary reason the cornea has no blood vessels?

• To maintain transparency

• To increase light absorption

• To enhance color detection

• To reduce its refractive power

What role does the iris play in the eye?

• It controls the pupil size

• It transmits impulses to the brain

• It detects light intensity

• It refracts light

How does the lens contribute to vision?

• By expanding the pupil

• By adjusting its shape to focus light

• By moving closer to the retina

• By permanently changing its shape

What is the main difference between rod cells and cone cells?

• Rod cells detect color, cone cells do not

• Cone cells function well in low light, rod cells do not

• Rod cells are sensitive to light intensity, cone cells to color

• Cone cells are found in the fovea, rod cells in the iris

What is the specific function of the fovea in the human eye?

• To control the pupil size

• To focus light precisely for clear vision

• To transmit visual information to the brain

• To protect the retina from intense light

Which cells in the retina allow us to see in color?

• Rod cells

• Lens cells

• Cone cells

• Iris cells

What is the role of the optic nerve in vision?

• To transmit visual information to the brain

• To adjust the lens shape

• To control the iris

• To detect light intensity

Why is the fovea crucial for clear vision?

• It contains only rod cells

• It regulates the amount of light entering the eye

• It is the attachment point for the optic nerve

• It is densely packed with cone cells