1. C-Notes: Anatomy of the EYE
Stnd: 9b
C-Notes: Anatomy of the EYE
05/19/2014
Objective:
SWBAT identify the structures and functions of the eye (sensory organ)

2. How do objects we see get detected by our eye?
Our eyes is an sensory organ used for vision that takes scattered or reflected light off an object to carry information to the brain to form an image
ex: if you were in a room with no light, you would not be able to see the words in your notebook because it does not give off its own light.

3. What are the structures of the human Eye?
1. SCLERA
white, tough outermost layer
helps keep the eye a spherical shape
(similar to the eyes of other mammals)

4. 6 muscles attach to the sclera

5. Sclera also forms the CORNEA
transparent (clear) part that light passes through
the pupil is an opening created by the iris, which is the colored part of the eye.
To see, light passes through the cornea and enters the eye through the pupil

7. 2. Choroid Coat
middle layer of the eye
supplies blood to outer layer of the retina

8. smooth muscles that change the shape of the lens
the anterior (front) of the choroid coat forms the CILIARY BODY, IRIS, PUPIL
3. Ciliary Body
smooth muscles that change the shape of the lens
4. Iris
colored part of the eye
5. Pupil
opening in the iris through which light enters the eye
smooth muscles control the size of the pupil

9. 6. AQUEOUS HUMOR
liquid between cornea and iris
maintains shape of cornea
produced by the ciliary body
7. VITREOUS HUMOR
clear, jelly-like liquid inside the eyeball
helps maintain spherical shape of eye

10. 8. RETINA
lining of the inner surface of the eye (inner layer)
contains neurons responsible for vision

13. Parts of the Retina
Rods and Cones
light receptors – 125 million rods (for “black/white” & night vision) – 7 million cones (for color vision)
Fovea Centralis
center of the retina – has cones only for sharp color vision
Optic Disc
spot where neurons come together to form the optic nerve
Blind Spot
no rods or cones

15. 9. LENS
biconvex: convex on both sides
can change shape to focus

22. Disorders of the Eye
Astigmatism
uneven curvature of the cornea
results in multiple focal points – makes images blurry

23. 2. Myopia (near sightedness)
distant objects are focused in front of the retina (eyeball is too long)
can be corrected with biconcave lens

24. 3. Hyperopia (far sightedness)
image is focused behind the retina (eyeball is too short)
can be corrected with a biconvex lens

25. 4. Presbyopia
ciliary muscles lose power and the person becomes farsighted – convex reading glasses help this
genetic disorder – person missing cones
5. Colorblindness
most colorblind people are red-green colorblind
aqueous humor does not drain
6. Glaucoma
results in pain and can lead to blindness as pressure inside eyeball damages retina

26. 7. Cataracts
lens becomes cloudy – usually with age

27. Cataract Vision

28. Review
What is the outermost layer of the eye called?
SCLERA
What is the clear part of the sclera in the front of the eye called?
CORNEA
What is the CHOROID COAT and what is formed on the ANTERIOR part?
It is the middle layer of the eye – anterior part forms the CILIARY BODY, IRIS, PUPIL
What is the inner layer of the eye?
RETINA
What are the 4 main parts of the retina?
RODS & CONES – FOVEA CENTRALIS – OPTIC DISC – BLIND SPOT

29. What shape is the lens?
BICONVEX
Where is the AQUEOUS HUMOR and the VITREOUS HUMOR located?
Aqueous Humor: between the cornea and the iris
Vitreous Humor: inside the eyeball

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