PSYC 2390 Chapter Notes - Chapter 3: Electromagnetic Spectrum, Ciliary Muscle, Retina

• School: University of Guelph
• Department: Psychology
• Course: PSYC 2390
• Professor: Lana Trick

Document Summary

Focusing light onto the retina: vision begins when visible light is reflected from objects into the eye. The eye: the eye is where vision begins. If the object is located more than about 20 feet away, the light rats that reach the eye are essentially parallel, and these parallel rays are brought to a focus on the retina at point a. But if the object moves closer to the eye, the light rays rejected from this object enter the eye at more of an angle, which pushes the focus point back to point b (further back than a) However, the light is stopped by the back of the eye before it reaches point. B, so the image on the retina is out of focus. If things remained in this state, the person would see the object as blurred. A process called accommodation keeps this from happening.