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PSYC 2410 (149)
Chapter 6

Chapter 6 Notes

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University of Guelph
PSYC 2410
Boyer Winters

Chapter 6 The Visual System61Light Enters the Eye and Reaches the Retinay No animal can see in complete darkness however some can see in very dim light y Light is defined as waves of electromagnetic energy that are between 380 and 760 nanometers y Wavelength and intensity are two properties of light that are particular interest wavelength because it plays an important role in the perception of color and intensity because it plays an important role in the perception of color while intensity play a role in the perception of brightness The Pupil and the Lensy Irises donut shaped bands of contractile tissue which regulate the amount of light and give our eyes their characteristic coloury Pupil where the light enters the eye a hole in the irisy Adjustment of pupil size in response to changes in illumination is a compromise between sensitivity ability to detect presence of dimly lit objects and acuity the ability to see the details of objectsy The pupils become constricted when the level of illumination is high and sensitivity is not important when constriction occurs the image on the retina is sharper and there is a greater depth of focusy When the level of illumination is low the pupils dilate to let in more lighty Lens focuses incoming light on the retin
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