1 / 11

The Eye

The Eye. Diagram of the Eye. Functions for the Parts of the Eye. Cornea – transparent outer surface of the eye that protects the eye and helps to focus the light Pupil – a hole that allows light to enter the eye

sal
Télécharger la présentation

The Eye

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Eye

  2. Diagram of the Eye

  3. Functions for the Parts of the Eye • Cornea – transparent outer surface of the eye that protects the eye and helps to focus the light • Pupil – a hole that allows light to enter the eye • Iris – a circular band of muscle that controls the size of the pupil, and therefore, controls the amount of light that enters the eye

  4. Functions continued • Lens – a convex lens that focuses the light to form an image on the retina • Retina – the inner lining at the back of the eye that as as a projection screen for the light entering the eye • Optic nerve – sends messages to the brain about the image

  5. Creating the Image • The human EYE gathers LIGHT from objects • In a healthy eye, a SMALLER, INVERTED, REAL image of an object is created on the RETINA at the back of the eye. • ELECTRICAL IMPULSES from the eye travel through the OPTIC NERVE to the BRAIN. • The brain ROTATES the image RIGHT SIDE UP.

  6. The Image on the Retina

  7. Focusing the Image • Eye MUSCLES change the SHAPE of the eye LENS. • This makes it possible to create a sharply FOCUSED image on the retina if an object is distant or nearby. Lens is more spherical Lens is flatter

  8. Eye Problems - Myopia • Myopia is near-sightedness • can see nearby objects clearly • distant objects appear out of focus because the light rays meet in front of the retina Myopia Normal

  9. Correcting Myopia • A DIVERGING LENS can correct myopia by SPREADING out the incoming LIGHT RAYS before they enter the eye

  10. Eye Problems – Hyperopia • Hyperopia is far-sightedness • Can see distant objects • Near by objects are not focused because light rays meet at an imaginary point behind the retina

  11. Correcting Hyperopia • Converging lens can correct hyperopia by refracting rays so that the meet at the retina instead of behind it

More Related