Psychology 1000 Chapter Notes - Chapter 5: Electromagnetic Spectrum, Far-Sightedness, Color Vision

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Mike Atkinson

Document Summary

Another way to improve vision is through laser eye surgery in which the cornea"s shape is changed. However, brightness sensitivity of both the rods and the cones depends on the wavelength of light: Human vision is finely attuned to colour difference threshold for light wavelengths are very small there are two different historical theories to explain colour vision. A second colour theory, called the opponent-process theory proposed that there are three types of cones, each responding to two different wavelengths: People with normal vision are trichromats, meaning they are sensitive to all three systems, red- green, blue-yellow and black-white. People who are dichromats are only sensitive to two, lacking either the red-green (most common) Colour deficient vision or blue-yellow sensitivity this is caused by an absence of hue-sensitive photopigment in certain cone types. Monochromats are only sensitive to the black-white system, and are completely colour blind. Once light energy is transformed into nerve impulses, the process of combining the messages.