Unit 1-Lecture 3.pptx - Unit 1-The Eye Lecture 3-The...

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Unit 1-The Eye Lecture 3-The Physiology of Vision
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Electromagnetic radiation – all energy waves from short gamma rays to long radio waves Our eyes respond to a small portion of this spectrum called the visible spectrum Different cones in the retina respond to different wavelengths of the visible spectrum Light
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Light Figure 15.10
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When light passes from one transparent medium to another its speed changes and it refracts (bends) Light passing through a convex lens (as in the eye) is bent so that the rays converge to a focal point When a convex lens forms an image, the image is upside down and reversed right to left Refraction and Lenses
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Pathway of light entering the eye: cornea, aqueous humor, lens, vitreous humor, and the neural layer of the retina to the photoreceptors Light is refracted: At the cornea Entering the lens Leaving the lens The lens curvature and shape allow for fine focusing of an image Focusing Light on the Retina
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Light from a distance needs little adjustment for proper focusing Far point of vision – the distance beyond which the lens does not need to change shape to focus (20 ft.) Focusing for Distant Vision Figure 15.13a
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Close vision requires: Accommodation – changing the lens shape by
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