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….
Nearsighted ness
Farsightedness
Astigmatism
Laser Eye surgery
Retinal transplant
Blindness-loss of centre of vision field or loss of peripheral vision
Colour blindness