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Healthy Eyes and Ears List the ways your eyes and ears help you understand your environment: - Recognize friends Read books Hear people Listen to favorite music Words to Know! • Nearsighted- you can see near objects, but distant objects appear blurry. • Farsighted- you can see far object clearly, but closer object appear blurry. • Astigmatism- the shape of your cornea or lens causes person’s vision blurry. Parts of the Eye • Optic – is the nerve that carries messages to the brain • Sclera – is the covering that protects the eye from the inside • Cornea – it lets the light in • Iris – it gives color to the eye Parts of the Eye • Pupil – it controls amount of light going in to the eye • Lens – it focuses the image • Retina – it changes light rays into images that your eyes can see Taking Care of Your Eyes • Protect your eyes from eyestrain - read in well-lighted room • Protect your eyes from injury - use protective gear for eyes • Protect your eyes from infection - do not rub your eyes • Get regular checkups Vision Problems • Nearsighted- you can see near objects, but distant objects appear blurry • Farsighted- you can see far object clearly, but closer object appear blurry • Astigmatism- the shape of your cornea or lens causes a wavy or blurred image Correcting Vision Problems • Eyeglasses • Contact lenses • Laser surgery Healthy Ears Words to know! • Sound waves- are vibrations or movement in the air • Decibels- the measurement of loudness of sound waves Parts of the Ear • Outer ear – it collects the sound waves • Middle ear – sound waves vibrate the ear drum and sends vibrations to cochlea • Inner ear – cochlea sends messages to the brain for interpretation Taking Care of Your Ears One important way to take care of your ears is to protect them from loud noises. Ear Problems • The most common ear problem is infection of the middle ear • The most serious problems are hearing loss and deafness • A total hearing loss can result from ear injury, disease, or birth defects Closure Summarize ways to care for your eyes and ears.
