Understanding Human Eyes

What might be a consequence of humans having much larger eyes?

• We might be mistaken for ghosts.

• Our selfies would look more normal.

• Dogs would stop barking at us.

• We would need smaller glasses.

What causes a stye to form on the eyelid?

• Excessive blinking

• Trapped bacteria and dead skin cells

• Too much sunlight exposure

• Lack of sleep

Which gland is associated with an internal stye?

• Lacrimal gland

• Gland of Zeiss

• Gland of Moll

• Meibomian gland

What is a common cause of dry eyes?

• High humidity

• Aging and certain medications

• Excessive tear production

• Frequent eye rubbing

What determines the color of our eyes?

• The thickness of the cornea

• The shape of the iris

• The amount and type of melanin

• The size of the pupil

Why did pirates wear eye patches?

• To adapt one eye to darkness

• To cover an injury

• To protect their eyes from sunlight

• To look intimidating

Why do some animals' eyes glow in the dark?

• They have built-in lights

• They have more photoreceptors

• Their eyes reflect light back to photoreceptors

• Their eyes absorb all light

What causes eyes to turn red in swimming pools?

• Chloramines formed from bodily fluids

• Salt in the water

• High water temperature

• Chlorine alone

What are eye floaters?

• Worms in the eye

• Tiny spots or strands in vision

• Excessive tears

• Dust particles on the cornea

What causes eye floaters to appear?

• Clumps of collagen fibers in the vitreous humor

• Excessive blinking

• High blood pressure

• Lack of sleep