Transcript Healthy Eyes

Chapter 11
Personal Health
and Consumer
Choices
Lesson 2
Healthy Eyes and Ears
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 optometrist
A health care 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
 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
 astigmatism
An eye condition in which images appear wavy
or blurry
 tinnitus
A constant ringing in the ears
 deafness
A condition in which someone has difficulty hearing
sounds or has complete hearing loss
 decibel
The unit for measuring the loudness of sound
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 Information
As 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
Eyes
Ears
Function
Care
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 Care
Never 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.
Parts of
the Eye
Eye Examinations
Two health care professionals you may see for eye
examinations are:
An optometrist
An 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:
Nearsightedness
Farsightedness
Astigmatism
astigmatism An eye condition in which images appear wavy or blurry
Healthy Ears
Ears not only allow you to hear sounds, they also
give you a sense of balance.
Ear Care
Wash 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.
Lesson 2 Review
What I Learned
Vocabulary What is the difference between an
optometrist and an ophthalmologist?
Lesson 2 Review
What I Learned
Identify What roles do hair cells play in hearing and
balance?
Lesson 2 Review
What I Learned
Explain What happens when sound waves reach your
outer ear?
Lesson 2 Review
Thinking Critically
Analyze Janet plays on the soccer team. She is
nearsighted and needs to correct her vision. What type
of vision correction do you think might be best for
Janet? Explain your reasoning.
Lesson 2 Review
Thinking Critically
Evaluate A woodshop produces noise that reaches
100 decibels. Should you wear ear plugs to reduce the
risks of injury to your ears while working in the
woodshop? Explain your reasoning.
End of
Chapter 11
Personal Health
and Consumer
Choices
Lesson 2
Healthy Eyes and Ears
Click for:
>> Main Menu
>> Chapter 11 Assessment