3.04 Functions and
disorders of the eye
3.04 Understand the functions and
disorders of the sensory system
1
3.04 Understand the functions and
disorders of the sensory system
Essential Questions
• What are the functions of the sensory system?
• What are some disorders of the sensory system?
• How are sensory system disorders treated?
• How do you relate the body’s communication to
the sensory system?
3.04 Understand the functions and
disorders of the sensory system
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Understanding the
functions of the eye
3.04 Understand the functions and
disorders of the sensory system
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Understanding the
functions of the eye
External eye

Orbit

Eyelids and eyelashes
Women blink twice as often
as men. Why do we blink?

Conjunctiva

Lacrimal apparatus

Extrinsic muscles
3.04 Understand the functions and
disorders of the sensory system
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Understanding the
functions of the eye
External eye

Extrinsic
muscles
3.04 Understand the functions and
disorders of the sensory system
5
Understanding the
functions of the eye
Internal eye
 Cornea
 Iris
 Pupil
3.04 Understand the functions and
disorders of the sensory system
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Understanding the
functions of the eye
Internal eye
 Ciliary body
 Lens
 Aqueous
humor
3.04 Understand the functions and
disorders of the sensory system
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Understanding the
functions of the eye
Internal eye
 Sclera

Choroid

Retina
3.04 Understand the functions and
disorders of the sensory system
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Understanding the
functions of the eye
Internal eye

Vitreous
humor
3.04 Understand the functions and
disorders of the sensory system
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Understanding the
functions of the eye
3.04 Understand the functions and
disorders of the sensory system
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Understanding the
functions of the eye
Process of Seeing

Trace the field of
vision.

Is there anything
strange about
this picture?
Explain
Why can’t you see in the dark?
3.04 Understand the functions and
disorders of the sensory system
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Understanding the
functions of the eye
Vision
What happens as you move
your paper away from and
toward to your eye?
3.04 Understand the functions and
disorders of the sensory system
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Understanding the
functions of the eye
Rods and cones of the retina
What are the functions of the rods and cones?
3.04 Understand the functions and
disorders of the sensory system
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3.04 Understand the functions and
disorders of the sensory system
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Vision Activity
Do you see what I see?
3.04 Understand the functions and
disorders of the sensory system
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Disorders of the eye
Glaucoma
Diabetic retinopathy
Cataract
Have you heard of these conditions?
What do you know about them?
3.04 Understand the functions and
disorders of the sensory system
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Disorders of the eye
Cataract
Describe this lens.
3.04 Understand the functions and
disorders of the sensory system
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Disorders of the eye
Cataract
How is a
cataract
treated?
3.04 Understand the functions and
disorders of the sensory system
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Disorders of the eye
Color blindness




Do you see the
number?
What is color
blindness?
What causes it?
Who is most likely to
have color blindness?
3.04 Understand the functions and
disorders of the sensory system
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Disorders of the eye
Conjunctivitis




What is conjunctivitis?
What are the symptoms?
What causes it?
How is it treated?
3.04 Understand the functions and
disorders of the sensory system
20
Detached retina
Discuss what happens
in this process.
What is the relevance
to health?
3.04 Understand the functions and
disorders of the sensory system
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Detached retina
Compare this process
to the previous picture.
What might cause this
condition?
3.04 Understand the functions and
disorders of the sensory system
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Disorders of the eye
Diabetic
retinopathy

What causes
diabetic
retinopathy?

What are the
symptoms?

Explain the impact
on vision.
3.04 Understand the functions and
disorders of the sensory system
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Disorders of the eye
Glaucoma



What are the
common symptoms
of glaucoma?
How is it
diagnosed?
How is it treated?
Tonometry
3.04 Understand the functions and
disorders of the sensory system
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Disorders of the eye
Macular degeneration

What is macular degeneration?

Compare the two types.

How is it diagnosed?

What is the treatment?
3.04 Understand the functions and
disorders of the sensory system
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Compare the symptoms and treatments of these
common eye disorders.
Can a person have more than one of these disorders? Explain.
3.04 Understand the functions and
disorders of the sensory system
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Testing vision

How do we test visual
acuity?

What is 20/20?

What does PERRLA
mean?
3.04 Understand the functions and
disorders of the sensory system
27
3.04 Understand the functions and
disorders of the sensory system
Essential Questions
• What are the functions of the sensory system?
• What are some disorders of the sensory system?
• How are sensory system disorders treated?
• How do you relate the body’s communication to
the sensory system?
3.04 Understand the functions and
disorders of the sensory system
28
3.04 Functions and
disorders of the eye
The End
3.04 Understand the functions and
disorders of the sensory system
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