Vision 1 - Vision 1 Module 1 Introduction Use vision to...

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Vision 1: Module 1: Introduction: Use vision to guide us through our environment and to extract information from it 1/3 of the brain is devoted to visual processing If visual sense is going us information that is conflict with another sense, we tend to bias our trust towards our sense of vision, seeing is believing The eye is primarily an instrument to collect, focus and sense the lights, processing occurs in the brain Module 2: The Stimulus: Light: Three physical characteristics of light that translate into the three psychological perceptions of our visual world: Amplitude: Light travels as a wave at abut 300000 km/sec Waves can very in the height of each wave (amplitude), and the distance between peaks of waves (wavelengths) The greater the amplitude of a wave, the more the light is being reflected or emitted by that object, and so the object appears brighter or more intense Wavelength is measured in nanometers Smaller wavelengths refer to light waves with higher frequency, higher wavelengths refer to light waves with lower frequency Humans are only sensitive to a tiny portion of the total range of wavelengths, the visible spectrum The shortest wavelength we can see is 360nm (violet), and the longest is 750nm (red) Other species can see more Bees, lower than 360, can tell the difference between more flowers Snakes, higher than 750, can see body heat in the dark Physical Light Property Our Psychological Perception Amplitude Brightness Wavelength Colour Purity Saturation (richness of colours) A light that is made of one wavelength is a “pure light” and the perceived colour would be completely saturated A light that is a combination of all the wavelengths would be perceived as white and would be completely de-saturated Most colours we see are not pure Module 3: The Eye:
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Light passes through the: Cornea: begins the focussing process Transparent window at the front of the eye Sclera: covers the rest of the eye A white, tougher membrane Pupil: light passes through here after the cornea The round window seen as black in the center of the eye Iris: the coloured part of the eye Controls the size of the pupil Band of muscles that is controlled by the brain If not enough light reaches the retina, these muscles cause the pupil to dilate into a larger opening and reverse Lens: light passes through here after the pupil A transparent structure that des the final focusing of the light on the retina The curvature of the lend causes the image to land on the retina upside down and reversed from left to right The final perceived image is the product of brain activity Lens is a flexible piece of tissue which can be altered by surrounding muscles which
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Vision 1 - Vision 1 Module 1 Introduction Use vision to...

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