201-L40-Visioncombined-2009ND slides

201-L40-Visioncombined-2009ND slides - Sensory Function:...

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Sensory Function: Vision OBJECTIVES : 1. Understand how is an image formed on the retina. 2. Understand how a photon striking the retina is ‘transduced’ into an electrical event.
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Optics of the Eye Light rays arrive from an object ‘focused’ onto sensory surface of the eye: retina Requires transparent tissue that ‘bends’ light rays: refraction refraction occurs when light passes from one medium (e.g., air ) into another (e.g., water )
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cornea lens Where does refraction take place? most refraction occurs at the cornea lens does critical ‘fine tuning’
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light ‘bends’ (refracts) upon entering new medium image looks out of focus ‘inverted’ focused image falls on plane of retina refracted light produces focused image behind retina ‘parallel rays’ from long distance close-up, rays no longer parallel…
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2. The entering angle of the light increases 3. The light gets more refracted (bent), so the focused image now falls onto the retina. To change focus the eye alters lens shape
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This note was uploaded on 03/24/2010 for the course PSIO 201 taught by Professor Stanescu during the Spring '08 term at University of Arizona- Tucson.

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201-L40-Visioncombined-2009ND slides - Sensory Function:...

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