When light enters the human eye, which structure first refracts (bends) incoming light?

• Lens

• Cornea

• Pupil

• Iris

The primary function of the iris is to:

• Detect light wavelengths

• Transmit visual signals to the brain

• Control the diameter of the pupil

• Generate electrical impulses

An upside-down image is initially formed on the:

• Cornea

• Lens

• Retina

• Optic nerve

Which eye structure acts most similarly to a magnifying glass in terms of light manipulation?

• Cornea

• Lens

• Pupil

• Iris

The optic nerve's primary role is to:

• Bend light

• Control pupil size

• Transmit visual signals to the brain

• Detect color variations

What happens when the pupil diameter changes?

• Brain receives different signals

• Color perception alters

• Amount of light entering the eye is regulated

• Lens shape permanently changes

In the context of vision, "focus" most closely means:

• Concentrating mental attention

• Adjusting light rays to create a clear image

• Closing one's eyes

• Detecting color variations

The retina's primary function is to:

• Generate light

• Bend incoming light

• Detect and convert light into neural signals

• Control eye muscle movements

Which structure regulates the amount of light entering the eye?

• Lens

• Cornea

• Optic nerve

• Iris

An eye's lens is most comparable to:

• A) A camera lens

• B) A microscope slide

• C) A color filter

• D) A neural pathway