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Chapter 11Personal Healthand ConsumerChoices
Lesson 2Healthy Eyes and Ears
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Teacher’s notes are available in the notes section of this presentation.
optometristA health care professional who is trained to examine the eyes for vision problems and to prescribe corrective lenses
A physician who specializes in the structure, functions, and diseases of the eye
ophthalmologist
An eye condition in which the lens becomes cloudy as a person ages
cataract
glaucoma An eye condition in which fluid pressure builds up inside the eye
An eye condition in which images appear wavy or blurry
astigmatism
A constant ringing in the ears tinnitus
deafness A condition in which someone has difficulty hearing sounds or has complete hearing loss
The unit for measuring the loudness of sound decibel
In this lesson, you will be able to
identify ways to keep your eyes healthy.
explain why people wear glasses or contact lenses.
describe ways to care for your ears.
Organizing InformationAs you read the lesson, create a chart that describes the function of each body part discussed in the lesson and how to care for it.
Body Part Function Care
EyesEars
Healthy Eyes
Like a camera, your eyes focus light in order to give your brain a picture of the world around you.
Eyes allow you to see shapes, colors, and motion.
Eye CareNever look directly at the sun.
Wear sunglasses to protect your eyes from UV rays.
Sit at least 6 feet from the television.
Change the position of your computer monitor to cut down on glare.
Make sure you have adequate lighting while you read, work, or watch TV.
Wear protective glasses or goggles for certain types of work and sports.
Don’t rub your eyes when something gets in them.
See a doctor immediately if you experience eye problems.
Eye Examinations
Two health care professionals you may see for eye examinations are:
An optometristAn ophthalmologist
optometrist A healthcare professional who is trained to examine the eyes for vision problems and to prescribe corrective lenses
ophthalmologist A physician who specializes in the structure, functions, and diseases of the eye
Eye Examinations
Cataracts and glaucoma must be treated promptly.
cataract An eye condition in which the lens becomes cloudy as a person ages
glaucoma An eye condition in which fluid pressure builds up inside the eye
Correcting Your Vision
The following vision problems can be helped with corrective glasses or contact lenses:
astigmatism An eye condition in which images appear wavy or blurry
Nearsightedness
Farsightedness
Astigmatism
Healthy Ears
Ears not only allow you to hear sounds, they also give you a sense of balance.
Ear CareWash and dry your ears regularly.
Use a wet washcloth to wipe off dirt and earwax on the outside of your ear.
Do not insert anything inside your auditory canal.
If you get water in your ears, use special ear drops to prevent infection.
Wear a hat, scarf, or ear muffs in cold weather.
See a doctor immediately if any parts of your ear hurts or become infected.
Hearing Damage
Common hearing problems are tinnitus and deafness.
tinnitus A constant ringing in the ears
deafness A condition in which someone has difficulty hearing sounds or has complete hearing loss
Hearing Damage
Normal conversation has a decibel level of about 60.
decibel The unit for measuring the loudness of sound
Noises above 90 decibels can permanently damage the hair cells in the inner ear.
Hearing Damage
Protect your hearing by wearing earplugs or protective headphones when you know you will be near loud sounds.
What I LearnedVocabulary What is the difference between anoptometrist and an ophthalmologist?
Lesson 2 Review
What I LearnedIdentify What roles do hair cells play in hearing andbalance?
Lesson 2 Review
What I LearnedExplain What happens when sound waves reach yourouter ear?
Lesson 2 Review
Thinking CriticallyAnalyze Janet plays on the soccer team. She isnearsighted and needs to correct her vision. What typeof vision correction do you think might be best forJanet? Explain your reasoning.
Lesson 2 Review
Thinking CriticallyEvaluate A woodshop produces noise that reaches100 decibels. Should you wear ear plugs to reduce therisks of injury to your ears while working in thewoodshop? Explain your reasoning.
Lesson 2 Review
Chapter 11Personal Healthand ConsumerChoicesLesson 2Healthy Eyes and Ears
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