Vision and Eye Health Quiz

What is a possible reason why humans have survived despite many having poor eyesight?

• Humans have always had perfect vision.

• Modern life is comfortable, allowing survival with poor eyesight.

• Natural selection favors poor eyesight.

• Animals with poor eyesight are more likely to survive.

How does the human eye adjust focus for objects at different distances?

• By moving the lens closer or farther from the retina.

• By changing the shape of the lens using muscles.

• By changing the size of the pupil.

• By rotating the eyeball.

What is the main function of the lens in the human eye?

• To produce tears.

• To detect color.

• To focus light onto the retina.

• To protect the eye from dust.

What is myopia and how is it typically caused?

• Double vision, caused by a misaligned lens.

• Blurry vision at all distances, caused by a flat cornea.

• Difficulty seeing far objects, caused by a long eye.

• Difficulty seeing close objects, caused by a short eye.

What is a common correction method for astigmatism?

• Using a lens that spreads light out slightly.

• Using a lens that changes color.

• Using a lens that blocks UV light.

• Using a lens that focuses light more sharply.

What is presbyopia and how is it related to aging?

• A condition where the lens becomes more elastic with age.

• A condition where the lens becomes less elastic with age.

• A condition where the cornea becomes thicker with age.

• A condition where the retina becomes more sensitive with age.

What has been identified as a potential cause for worsening eyesight in developed countries?

• Improved nutrition and health care.

• Less time spent outdoors in bright sunlight.

• Increased time spent reading books.

• Genetic changes over the last century.

What is the theoretical limit of human vision when lenses are perfectly adjusted?

• 20/8

• 20/20

• 20/15

• 20/10

Why can't humans see as much detail as birds of prey?

• Humans have a thicker cornea.

• Humans have larger eyes.

• Humans have fewer cone cells on their retinas.

• Humans have a different lens shape.

What unusual ability might people have after having their natural lenses removed?

• Seeing through walls.

• Seeing ultraviolet light.

• Seeing in the dark.

• Seeing infrared light.