3.04 Functions and disorders of the eye 3.04 Understand the functions and disorders of the sensory system 1

2 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?

Understanding the functions of the eye 3.04 Understand the functions and disorders of the sensory system 3

Understanding the functions of the eye External eye Orbit Orbit Eyelids and eyelashes Eyelids and eyelashes Women blink twice as often as men. Why do we blink? Conjunctiva Conjunctiva Lacrimal apparatus Lacrimal apparatus Extrinsic muscles Extrinsic muscles 3.04 Understand the functions and disorders of the sensory system 4 Interesting tidbit

Understanding the functions of the eye External eye Extrinsic muscles Extrinsic muscles 3.04 Understand the functions and disorders of the sensory system 5 Which extrinsic muscle allows you to look upward?

Understanding the functions of the eye Internal eye Cornea Cornea Iris Iris Pupil Pupil 3.04 Understand the functions and disorders of the sensory system 6

Understanding the functions of the eye Internal eye Ciliary body Ciliary body Lens Lens Aqueous humor Aqueous humor 3.04 Understand the functions and disorders of the sensory system 7

Understanding the functions of the eye Internal eye Sclera Sclera Choroid Choroid Retina Retina 3.04 Understand the functions and disorders of the sensory system 8

Understanding the functions of the eye Internal eye Vitreous humor Vitreous humor 3.04 Understand the functions and disorders of the sensory system 9

Understanding the functions of the eye 3.04 Understand the functions and disorders of the sensory system 10

Understanding the functions of the eye Process of Seeing Trace the field of vision. Trace the field of vision. Is there anything strange about this picture? Explain Is there anything strange about this picture? Explain 3.04 Understand the functions and disorders of the sensory system 11 Why can’t you see in the dark?

Understanding the functions of the eye 3.04 Understand the functions and disorders of the sensory system 12 What happens as you move your paper away from and toward to your eye? Vision

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 13 Understanding the functions of the eye

3.04 Understand the functions and disorders of the sensory system 14 Check your knowledge!

3.04 Understand the functions and disorders of the sensory system 15 Vision Activity Do you see what I see?

Disorders of the eye 3.04 Understand the functions and disorders of the sensory system 16 Cataract Glaucoma Hyperopia Myopia Presbyopia Astigmatism Diabetic retinopathy Detached retina Have you heard of these conditions? What do you know about them? Color blindness Conjunctivitis

Disorders of the eye Describe this lens Understand the functions and disorders of the sensory system 17 Cataract

Disorders of the eye Cataract How is a cataract treated? 3.04 Understand the functions and disorders of the sensory system 18

Disorders of the eye Color blindness Do you see the number? Do you see the number? What is color blindness? What is color blindness? What causes it? What causes it? Who is most likely to have color blindness? Who is most likely to have color blindness? 3.04 Understand the functions and disorders of the sensory system 19

Disorders of the eye Conjunctivitis What is conjunctivitis? What is conjunctivitis? What are the symptoms? What are the symptoms? What causes it? What causes it? How is it treated? How is it treated? 3.04 Understand the functions and disorders of the sensory system 20

Detached retina 3.04 Understand the functions and disorders of the sensory system 21 Discuss what happens in this process. What is the relevance to health?

3.04 Understand the functions and disorders of the sensory system 22 Detached retina Compare this process to the previous picture. What might cause this condition?

Disorders of the eye Diabetic retinopathy What causes diabetic retinopathy? What causes diabetic retinopathy? What are the symptoms? What are the symptoms? Explain the impact on vision. Explain the impact on vision Understand the functions and disorders of the sensory system 23

Disorders of the eye Glaucoma What are the common symptoms of glaucoma? What are the common symptoms of glaucoma? How is it diagnosed? How is it diagnosed? How is it treated? How is it treated? 3.04 Understand the functions and disorders of the sensory system 24

Disorders of the eye Macular degeneration What is macular degeneration? What is macular degeneration? Compare the two types. Compare the two types. How is it diagnosed? How is it diagnosed? What is the treatment? What is the treatment? 3.04 Understand the functions and disorders of the sensory system 25

3.04 Understand the functions and disorders of the sensory system 26 Compare the symptoms and treatments of these common eye disorders. Can a person have more than one of these disorders? Explain. Problems with Focus

Testing vision How do we test visual acuity? How do we test visual acuity? What is 20/20? What is 20/20? What does PERRLA mean? 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 28 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 Functions and disorders of the eye The End 3.04 Understand the functions and disorders of the sensory system 29