brief intro to eye anatomy

1. Vision (pg 14)

2. Structure of the Eye
• Cornea: Clear “window” that lets light into the
eye

3. Structure of the Eye
• Cornea: Clear “window” that lets light into the
eye
• Iris: Colored part of the eye. Doughnut
shaped. Has muscles that constrict or dilate
the iris to change the size of the pupil

4. Structure of the Eye
• Cornea: Clear “window” that lets light into the
eye
• Iris: Colored part of the eye. Doughnut
shaped. Has muscles that constrict or dilate
the iris to change the size of the pupil
• Retina: Lines the posterior ¾ of the eyeball.
Contains photoreceptors, which detect light

5. Structure of the Eye
• Cornea: Clear “window” that lets light into the
eye
• Iris: Colored part of the eye. Doughnut
shaped. Has muscles that constrict or dilate
the iris to change the size of the pupil
• Retina: Lines the posterior ¾ of the eyeball.
Contains photoreceptors, which detect light
• Lens: transparent, convex structure that
focuses light onto the retina

6. Structure of the Eye
• Cornea: Clear “window” that lets light into the
eye
• Iris: Colored part of the eye. Doughnut shaped.
Has muscles that constrict or dilate the iris to
change the size of the pupil
• Retina: Lines the posterior ¾ of the eyeball.
Contains photoreceptors, which detect light
• Lens: transparent, convex structure that focuses
light onto the retina
• Anterior cavity: space in front of the lens. Filled
with aqueous humor (watery)

7. Structure of the Eye
• Cornea: Clear “window” that lets light into the
eye
• Iris: Colored part of the eye. Doughnut shaped.
Has muscles that constrict or dilate the iris to
change the size of the pupil
• Retina: Lines the posterior ¾ of the eyeball.
Contains photoreceptors, which detect light
• Lens: transparent, convex structure that focuses
light onto the retina
• Anterior cavity: space anterior to the lens. Filled
with aqueous humor (watery)
• Vitreous chamber: large cavity behind the lens.
Filled with vitreous humor (jelly-like)

8. Photoreceptors
• Rods: 120 million. Sensitive to dim light. Only
see black and white. Most abundant at edges
of retina

9. Photoreceptors
• Rods: 120 million. Sensitive to dim light. Only
see black and white. Most abundant at edges
of retina.
• Cones: 6 million. 3 types: blue, green, and red.
Stimulated by brighter light. Allows color
vision.

10. Pop Quiz!
• Hold up “rod” or “cone” sign

11. Pop Quiz!
1. Responsible for peripheral vision

12. Pop Quiz!
1. Responsible for peripheral
vision
RODS

13. Pop Quiz!
2. Used in moonlight

14. Pop Quiz!
2. Used in moonlight
RODS

15. Pop Quiz!
3. Missing in color-blind people

16. Pop Quiz!
3. Missing in color-blind people
CONES

17. Pop Quiz!
4. If these are damaged you should
not drive at night

18. Pop Quiz!
4. If these are damaged you should
not drive at night
RODS