html5-img
1 / 13

EYE

EYE. The eye is an extension of the brain. Eye brain proxomity. Can you see : the optic nerve bundle? Spinal cord?. Cross section. You must know the position of: Retina Lens Cornea Sclerotic Optic nerve Cilary muscles Suspensory ligaments. Retina – receives the image.

shadi
Download Presentation

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. EYE The eye is an extension of the brain

  2. Eye brain proxomity • Can you see : • the optic nerve bundle? • Spinal cord?

  3. Cross section You must know the position of: Retina Lens Cornea Sclerotic Optic nerve Cilary muscles Suspensory ligaments

  4. Retina – receives the image • Full of light receptors which are sensitive to: • Colour • Light levels • Massive blood supply is also needed Fovea is the main focal point and has greatest density of light receptors

  5. Retina receptors • Light receptors are called rods and cone

  6. Focusing on objects • The lens and cornea focus the light on the retina

  7. Focusing • The lens job is to make the rays hit the same point The red rays will be out of focus

  8. Bending light • Light is refracted and bent to focus it as it passes through the lens • Lens thickness can be changed so the amount of bending is changed

  9. Near vision • to bend the light more to focus it • Fat lens needed

  10. Distance vision • Rays enter the eye closer together • Need less bending • Thinner lens needed

  11. Changing lens thickness • Cilary muscles are attached to the lens, when contracted they pull the lens thin • The lens is slightly elastic, its relaxed state is short and fat.

  12. Controlling light levels • Your eye are very sensitive and can be damaged by harsh light. • Your iris controls light allowed into the eye by changing the size of the pupil

  13. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.

More Related