chapter 14 the human eye structure and function of the eye (concept map) 3 july 2015
TRANSCRIPT
![Page 1: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/1.jpg)
Chapter 14 The Human EyeStructure and Function of the Eye (Concept Map)April 19, 2023
![Page 2: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/2.jpg)
Vertical Section of The Human Eye
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 2
![Page 3: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/3.jpg)
Attaches lens to ciliary body
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 3
suspensory ligament
Vertical Section of The Human Eye
![Page 4: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/4.jpg)
Controls amount of light enteringthe eye
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 4
iris
suspensory ligament
Vertical Section of The Human Eye
![Page 5: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/5.jpg)
Refracts light rays;keeps eyeball firm
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 5
aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
![Page 6: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/6.jpg)
Allows light to enter the eye
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 6
pupil
aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
![Page 7: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/7.jpg)
Refracts light rays into pupil
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 7
cornea
pupil
aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
![Page 8: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/8.jpg)
lens
Focuses light rays onto retina
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 8
cornea
pupil
aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
![Page 9: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/9.jpg)
ciliary body
Contains ciliary muscles which control curvature or thickness of the lens
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 9
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
![Page 10: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/10.jpg)
viteroushumour
Refracts light rays;keeps eyeball firm
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 10
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
![Page 11: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/11.jpg)
Controls movement of eyeball
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 11
viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
rectusmuscles
Vertical Section of The Human Eye
![Page 12: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/12.jpg)
Protects against mechanical injury
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 12
viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
sclera
rectusmuscles
Vertical Section of The Human Eye
![Page 13: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/13.jpg)
Pigmented black toprevent internal reflection of light; blood vessels bring oxygen and nutrients to the eyeball
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 13
viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
choroid
sclera
rectusmuscles
Vertical Section of The Human Eye
![Page 14: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/14.jpg)
Region where images are sharply focused
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 14
viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
fovea(yellow spot)
choroid
sclera
rectusmuscles
Vertical Section of The Human Eye
![Page 15: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/15.jpg)
Transmit nerve impulsesfrom eye to brain
optic nerve
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 15
fovea(yellow spot)
choroid
sclera
rectusmuscles
viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
![Page 16: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/16.jpg)
Region over optic nerve; no photoreceptors, so insensitive to light
blind spot
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 16
viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
optic nerve
fovea(yellow spot)
choroid
sclera
rectusmuscles
Vertical Section of The Human Eye
![Page 17: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/17.jpg)
Light-sensitive layer containingcones responsible for colour vision in bright light and rods responsible for vision in dim light
retina
April 19, 2023 Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 17
viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
blind spot
optic nerve
fovea(yellow spot)
choroid
sclera
rectusmuscles
Vertical Section of The Human Eye
![Page 18: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/18.jpg)
Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 18
Vertical Section of The Human Eye
Pupil Reflex
A reflex action in which the pupil changes size as a result of changes in light intensity.
![Page 19: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/19.jpg)
Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 19
Vertical Section of The Human Eye
Pupil Reflex
In bright light
![Page 20: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/20.jpg)
Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 20
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
Vertical Section of The Human Eye
Pupil Reflex
![Page 21: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/21.jpg)
Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 21
Vertical Section of The Human Eye
Pupil Reflex
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
In dim light
![Page 22: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/22.jpg)
Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 22
In dim light• Radial muscles in iris contract .• Circular muscles in iris relax.• Pupil enlarges, hence more light enters the eye
Vertical Section of The Human Eye
Pupil Reflex
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
![Page 23: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/23.jpg)
Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 23
Vertical Section of The Human Eye
Pupil Reflex Focusing
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
The adjustment of the lens of the eye so that clear images of objects at different distances are formed on the retina.
In dim light• Radial muscles in iris contract .• Circular muscles in iris relax.• Pupil enlarges, hence more light enters the eye
![Page 24: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/24.jpg)
Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 24
Vertical Section of The Human Eye
Pupil Reflex Focusing
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
Distant object (7 metres or more)
In dim light• Radial muscles in iris contract .• Circular muscles in iris relax.• Pupil enlarges, hence more light enters the eye
![Page 25: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/25.jpg)
Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 25
Vertical Section of The Human Eye
Pupil Reflex Focusing
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
Distant object (7 metres or more)
• Ciliary muscles relax• Suspensory ligament become taut• Lens becomes thinner and less convex
In dim light• Radial muscles in iris contract .• Circular muscles in iris relax.• Pupil enlarges, hence more light enters the eye
![Page 26: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/26.jpg)
Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 26
Vertical Section of The Human Eye
Pupil Reflex Focusing
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
Distant object (7 metres or more)
• Ciliary muscles relax• Suspensory ligament become taut• Lens becomes thinner and less convex
Near objectIn dim light• Radial muscles in iris contract .• Circular muscles in iris relax.• Pupil enlarges, hence more light enters the eye
![Page 27: Chapter 14 The Human Eye Structure and Function of the Eye (Concept Map) 3 July 2015](https://reader033.vdocuments.net/reader033/viewer/2022061618/56649d745503460f94a540be/html5/thumbnails/27.jpg)
Copyright © 2006-2011 Marshall Cavendish International (Singapore) Pte. Ltd. 27
Distant object (7 metres or more)
• Ciliary muscles relax• Suspensory ligament become taut• Lens becomes thinner and less convex
Near object• Ciliary muscles contract• Suspensory ligaments slacken• Lens becomes thicker and more convex
Vertical Section of The Human Eye
Pupil Reflex Focusing
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
In dim light• Radial muscles in iris contract .• Circular muscles in iris relax.• Pupil enlarges, hence more light enters the eye