THE EYE
HOW DO WE SEE?
By a series of steps involving the structures of the eye and the brain
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!!!
WHAT ARE THE PARTS OF THE EYE?
CORNEA
Transparent front surface of the eye Protects the inside of the eye Acts as a windshield
IRIS
Colored muscular structure that contracts and expands to control the amount of light that enters the eye.
Surround the pupil.
PUPIL
A HOLE! That lets light in.
LENS
Behind the pupil lens that perfects the image by refracting the light
What shape is it? Convex
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
MORE ABOUT CONES
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.
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.’
HOW WOULD I CORRECT MY VISION
Use a variety of concave and convex lenses called glasses or contacts.
NOW THAT WE KNOW WHAT PARTS THERE ARE….
Let’s find out where they are in the eye!