1. THE EYE

2. HOW DO WE SEE?
 By a series of steps involving the structures of
the eye and the brain

3. WHAT IS THE NUMBER ON MOST IMPORTANT
THING WE NEED IN ORDER TO SEE?
 The brain
 Yes
 The Eye
 Sure, obvious
 How about LIGHT!
 That’s kind of important
 Without light there would be no
sight!!!

4. WHAT ARE THE PARTS OF THE EYE?

5. CORNEA
 Transparent front surface of the eye
 Protects the inside of the eye
 Acts as a windshield

6. IRIS
 Colored muscular structure that contracts and
expands to control the amount of light that
enters the eye.
 Surround the pupil.

7. PUPIL
 A HOLE! That lets light in.

8. LENS
 Behind the pupil lens that perfects the image by
refracting the light
 What shape is it?
 Convex

9. RETINA
 Layer of cells along the inside lining of the eye
 Contains the Rod and Cone cells
 RODS – see dim or bright light, only black and white
 CONES – see color in three different bands

10. MORE ABOUT CONES

11. OPTIC NERVE
 Sends an electrical impulse to the brain
transmitting the image to the brain.
 Brian turns it right side up and recognizes the
image.

12. BLIND SPOT
 We all have one!
 There are no rod or cone cells where the optic
nerve connects to the retina. This causes us to
have a spot in each eye where we cannot take
information or ‘See.’

13. HOW WOULD I CORRECT MY VISION
 Use a variety of concave and convex lenses called
glasses or contacts.

14. NOW THAT WE KNOW WHAT PARTS
THERE ARE….
 Let’s find out where they are in the eye!