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Vision - on near objects requires bifocals Vision...

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Vision 1. Light 1. Wave characteristics 2. The Eye 1. Structure of the eye 2. Problems with vision 3. Colour 1. Rods and cones 2. Colour blindness Light Physical Characteristics transduction : conversion of external stimulus energy into internal neural energy that can be sensed wavelength : distance from peak to peak of the wave; determines hue (colour) intensity : distance from top to bottom, or amplitude (height); determines brightness
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Wavelength & Amplitude The Eye Common Problems with Vision short-sightedness ( myopia ) = image focused in front of retina; eye is too long far-sightedness ( hypermetropia ) = image focused behind retina; eye is too short aging eyes ( presbyopia ) = the lens stiffens with age and won’t curve; harder to focus
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Unformatted text preview: on near objects; requires bifocals Vision: Normal & Abnormal Transduction & Transmission Finding Your Blind Spot + . 2 inches- hold 6-10 inches away, close your right eye, and look at the dot- the blind spot is where the optic nerve exits the back of the eye Retinal Receptors ± rods : retinal receptors that detect shading of black, white & grey; more in the periphery; important at night ± cones : retinal receptors that detect colours; concentrated in the fovea (centre); important in the day time and for fine detail Protanopia Normal Protanope Deuteranopia Normal Deuteranope Deuteranopia Normal Deuteranope Tritanopia Normal Tritanope...
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