topaz
Uploaded by
13 SLIDES
271 VUES
130LIKES

Understanding the Human Eye: Structure, Function, and Light Perception

DESCRIPTION

This chapter delves into the fascinating physics of the human eye, exploring how light, an electromagnetic radiation, is perceived through its intricate structure. We discuss the critical role of the three layers of the eye: the fibrous tunic, vascular tunic, and retina, as well as the function of key components like the cornea, lens, and photoreceptors. Learn about the importance of wavelength, image formation, and common vision problems such as presbyopia and astigmatism. Discover how eye muscles enable movement and the protective roles of eyelids and tears.

1 / 13

Télécharger la présentation

Understanding the Human Eye: Structure, Function, and Light Perception

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

Playing audio...

  1. Chapter 2 The Human Eye

  2. Physics Review • Light • Electromagnetic radiation • Wavelength determines quality • Measured in nanometers • Why light? • Reliable: Travels very fast and straight • Prevalent: Lots of it • Informative: Reflected/Absorbed by surface molecules

  3. The Head • Eye placement: • Lateral vs. Frontal • Skull: Orbit • Eye Movement • 6 extra-ocular muscles: • Conjugate: move together • Vergence: move opposite • Eyelids: • Protection and moisture • Blinking and Distance • Tears

  4. Eye Function • Image: light distribution that preserves the spatial ordering of locations in space • Image formation – reversing light divergence • Optical power of: • 1) cornea: 2/3rds of eye’s optical power • 2) lens: flexing called accommodation

  5. Eye Structure • Three layers: • Protecting: Fibrous Tunic • Nourishing: Vascular Tunic • Detecting: Retina

  6. Fibrous Tunic • Sclera – “white” of eye, dense material, gives eye it’s shape • Cornea – transparent “bulge”, allows light into eye

  7. Out of Focus

  8. Problems with Lens • Presbyopia: • loss of sight with age • Astigmatism: • Distortion of cornea

  9. Vascular Tunic • Choroid • Pigment epithelium • Contains blood vessels and capillaries • Reduces light scatter and disposes of waste • Anterior Chamber • Manufactures aqueous humor • Contains: • Iris/Pupil • Lens

  10. Retina • Contains photoreceptors • Landmarks: • Macula (1.5mm diameter): focus of eye, contains fovea • Optic Disk: “blind spot”

  11. Photoreceptors • Order of stimulation:

  12. Photopigments • Two components • Opsin: large protein, 3 types • Retinal: from vitamin A • Phototransduction

  13. Wavelength Sensitivities

More Related