The Human Eye and Vision 1 (Producing The Image) - PowerPoint PPT Presentation

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The Human Eye and Vision 1 (Producing The Image)

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... outer wall of the eye is formed by the hard, ... Eye lens is made of transparent fibers in a clear membrane. Suspended by ... 'detector' for the eye. ... – PowerPoint PPT presentation

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Date added: 12 July 2020
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Learn more at: http://www.cis.rit.edu
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Tags: eye | human | image | producing | vision

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Title: The Human Eye and Vision 1 (Producing The Image)


1
The Human Eye and Vision 1(Producing The Image)
2
In this section . . .
  • Anatomy of human eye
  • Image formation by human eye
  • Method of light detection
  • Retinal processing
  • Eye optical defects and diseases

3
Human Visual System
Detection
Processing
Exposure Control
Image formation
  • Retina
  • Rods
  • Cones
  • Brain
  • Cornea
  • Lens
  • Iris/pupil
  • Photoreceptor
  • sensitivity

4
Human Eye
Ciliary Muscle
Sclera
Ear side (Temporal)
Iris
Vitreous Humor
Fovea
Pupil
Eyelens
Retina
Optic Nerve
Cornea
Nose side (Nasal)
Aqueous Humor
Choroid
Suspensory ligament
  • Human eye is a complete imaging system.

5
Image Formation
Object
Image
  • The curved surfaces of the eye focus the image
    onto the back surface of the eye.

6
Cornea
  • The outer wall of the eye is formed by the hard,
    white sclera.
  • Cornea is the clear portion of the sclera.
  • 2/3 of the refraction takes place at the cornea.

Sclera
Cornea
7
Iris and Pupil
Iris
  • Colored iris controls the size of the opening
    (pupil) where the light enters.
  • Pupil determines the amount of light, like the
    aperture of a camera.

Pupil
Iris open Dilated pupil
Iris closed Constricted pupil
8
Lens
Ciliary muscle
  • Eye lens is made of transparent fibers in a clear
    membrane.
  • Suspended by suspensory ligament.
  • Used as a fine focusing mechanism by the eye
    provides 1/3 of eyes total refracting power.
  • Non-uniform index of refraction.

Lens
Suspensory Ligament
Transparent Fibers
Cross section of the eye lens
9
Accommodation
Distant object
  • The suspensory ligaments attach the lens to the
    ciliary muscle.
  • When the muscle contracts, the lens bulges out in
    the back, decreasing its focal length.
  • The process by which the lens changes shape to
    focus is called accommodation.

Relaxed muscle Taut ligaments
Near object
Contracted muscle Slack ligaments
10
Aqueous Humor and Vitreous Humor
  • Transparent gelatinous liquid filling the eye.
  • Provides nutrients to the cornea and eye lens.
  • Also helps maintain the eyeball shape with its
    pressure.

Vitreous Humor
Aqueous Humor
11
Retina
  • Retina is the photosensitive detector for the
    eye.
  • Two types of receptors in the retina rods for
    low light level, and cones for color.
  • Located at the center of the retina, fovea
    contains a greater concentration of cones.
  • Signals from the receptors leave through the
    optic nerve to the brain.

Retina
Fovea
Optic Nerve
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