1 / 23

Night Vision & Eye Rods & Cones

Learn how eye rods and cones function in the dark and daylight, affecting our vision. Discover the role of red light in maintaining night vision. Find out the differences between rods and cones in perceiving monochrome and colored images. Explore the sensitivity of rods and their slow recovery time in bright light. See how cones allow us to perceive colors and how they are less sensitive than rods. Understand the importance of both types of cells in the human retina for optimal visual perception.

hardind
Download Presentation

Night Vision & Eye Rods & Cones

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. Night Vision & Eye Rods & Cones Bowmaker J.K. and Dartnall H.J.A. (1980). "Visual pigments of rods and cones in a human retina". M.R.C. Vision Unit, University of Sussex, Falmer, Brighton, BN1 9QG, Sussex. J. Physiol. 298: 501–511, 1980

  2. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  3. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  4. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  5. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  6. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  7. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  8. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  9. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  10. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  11. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  12. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  13. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  14. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  15. Color Selection Eye Focal Points • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision

  16. Color Selection Eye Focal Points Read Read Read Read Read Read Read Read Read Read Read Read

  17. Color Selection Eye Focal Points Read Read Read Read Read Read Read Read Read Read Read Read

  18. Contrast • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision • So much for BLUE

  19. Contrast & Transparent Windows • Rods • Let us see monochrome images • Very sensitive to brightness • Saturate in bright light need time to recover (~ 15 min) • Let us see at night • Cones • Let us see in color • Less sensitive than rods • Red light does not stimulate Rods • Red maintains night vision & allows some cone vision • So much for BLUE • Hello • I am transparent • Are your overloaded yet

  20. Field Of View & Eye Rod Cone Distribution • Field of view determined by eye rod cone distribution Density 103 (mm2) Cone Distribution B------R--G--R------B 160 Fovea 120 Rods Rods 80 Optic Nerve 40 Cones Cones 0 Ear 60 40 20 0 20 40 60 80 Nose Offset (Degrees)

  21. 15o Optimum 15o 35o Max 35o Max 35o Max 40o Max 15o Optimum Normal Line of Sight 20o Max 15o Optimum Field of View Eye Rotation

  22. 65o Max 0o Optimum 60o Max 60o Max Normal Line of Sight 35o Max Field of View Head Rotation

  23. 15o Optimum 15o 90o Max 15o Optimum Normal Line of Sight 95o Max 95o Max 95o Max 15o Optimum Field of View Eye & Head Rotation

More Related