The Eye as a Camera - PowerPoint PPT Presentation

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The Eye as a Camera

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Title: An Introduction to Vision Author: Michael Sandberg Last modified by: Michael Sandberg Created Date: 10/11/2005 3:15:53 PM Document presentation format – PowerPoint PPT presentation

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Title: The Eye as a Camera


1
The Eye as a Camera
  • Michael A. Sandberg, Ph.D.
  • Associate Professor of Ophthalmology
  • Berman-Gund Laboratory for the Study of Retinal
    Degenerations
  • Harvard Medical School
  • Massachusetts Eye and Ear Infirmary

2
Principal parts of the camera
  • The lens and filters
  • Cornea
  • Lens
  • Macular pigment
  • The aperture
  • Pupil
  • The shutter
  • Retina
  • The film
  • Retina

3
Schematic eye
4
Optical power of the human eye
  • Cornea 43 diopters
  • Lens (eye focused at infinity) 20 diopters
  • Lens (eye focused at near) 28 diopters

5
Monocular visual field
6
Visual angle of common objects
  • Sun or moon 0.5
  • Thumbnail (at arms length) 1.5
  • Fist (at arms length) 8 - 10

7
Optical aberrations
  • Spherical aberration lt 0.5 diopter
  • Chromatic aberration 2 diopters

8
Distribution of macular pigment
9
Range of Vision
10
Critical duration
11
Critical flicker frequency
12
Visual acuity versus pupil size
13
Normal Fundus
14
The Human Retina
15
Schematic retina
16
Foveal architecture
17
In vivo microscopy
18
Photoreceptor structure
19
Photoreceptor architecture
20
Directional sensitivity
21
Photoreceptor architecture
22
Rhodopsin localization
23
Rhodopsin regeneration
24
Cone pigment regeneration
25
Dark adaptation
26
Effect of bleaching on threshold
27
Rod and cone spectra
28
Luminous efficiency curves
29
Spectral sensitivity curves
30
Number of photoreceptors in the human retina
31
Photoreceptor distribution
32
Photoreceptor mosaic
33
Foveal cone mosaic
34
Visual acuity versus eccentricity
35
Visual acuity versus luminance
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