PSY280H1 Chapter 3: Ch3 Textbook Notes
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PSY280H1 Full Course Notes
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Document Summary
Vision is based on visible light, a band of energy within the electromagnetic spectrum, a continuum of electromagnetic energy produced by electric charges and is radiated as waves. Wavelength, the distance between the peaks of the electromagnetic waves. Visible light ranges from ~400-700 nanometres (nm) Light can also be described as consisting of small packets of energy called photons. Light reflected from objects enters the eye through the pupil, it is focused by the cornea and lens to form sharp images of the objects on the retina, which contains the receptors for vision. Rods, visual receptors that contain light-sensitive chemicals called visual pigments. Signals converge and travel to the brain via the optic nerve. Cornea, the transparent covering of the front of the eye, accounts for ~80% of the eye s focusing power, fixed so cannot adjust focus. Lens, ~20%,changes its shape to adjust the eye s focus.
