2. The retina is a layer of light- sensitive cells in the back of the eye.

3. Photoreceptors are specialized neurons that detect light and are found in the retina.

4. Rods are the photoreceptors that detect dim light. These help determine shades of grey at night.

5. Cones are the photoreceptors that detect bright light and help you see colors. Both rods and cones connect to nerve cells to send signals to your brain.

6. The optic nerve is the nerve that transfers electrical impulses from the eye to the brain.

7. The iris is the colored part of the eye. It is made of muscles to open and close the pupil.

8. The pupil is the opening at the front of the eye inside the iris. This is where light enters the eye.

9. The cornea is a transparent membrane that is found on the front of the eye. It protects the eye, but allows light to enter.

10. The lens is a curved, transparent object that forms an image by refracting light. It is located behind the pupil and the iris.

11. Aqueous humor is clear fluid found between the cornea and the lens. It helps maintain the shape of the eye.

12. Vitreous humor is a clear, jelly- like substance between the lens and the retina. This also helps maintain the shape of the eye.

13. Sclera is the white of the eye. This is where the blood vessels provide the eye with nutrients and oxygen.

14. Using this picture, label the parts of the eye found on the back of your notes. Aqueous humor

15. The End