1. The Human Eye and Vision
Section 5
The Human Eye and Vision

2. Convex lens Converges light to a focal point
Produces a real image that is upside down

3. Concave lens Diverges light
Produces a virtual image that is right side up

4. The Human Eye
You see light through a series of steps that involve the various parts of the eye

5. The Human Eye Light enters the eye through the pupil
The Iris adjusts how much light enters.
It passes through the lens where it is focused on the retina.
Ciliary muscles adjust the lens to focus it on the retina
The image on the retina is sent to the brain by the optic nerve

6. The Human Eye

7. The Human Eye Ciliary Muscles Sclera (white of eye) Cornea Retina Iris
Choroid
(membrane containing
blood supply and a dark
pigment that reduces
reflection of light
within the eye)
Iris
Pupil
Lens
Blind spot
Aqueous humor
(clear fluid that
maintains shape
of front of eye)
Blood vessels
Vitreous humor
(gelatinous filling that
maintains eye shape)
Optic nerve

8. Correcting Vision
The image falls on the retina in normal vision

9. Farsightedness
The image falls in back of the retina instead of on the retina
Can see far away

10. Correcting Far Sightedness Convex Lens

11. Near Sightedness
The image falls in front of the retina instead of on the retina
Can see close up

12. Correcting Nearsightedness Concave Lens