Vision and the Structure of the Eye Answers

Responses may vary but should include some or all of the following information: A cone is a visual receptor that assists individuals in processing daytime vision and color. A rod is a visual receptor that assists individuals in processing nighttime and peripheral vision.

Responses may vary but should include some or all of the following information: The optic nerve, leading from the eyeball, allows information that we see to travel to the optic chiasm. This is the point at which axons from the inside half of each eye cross over and project to the opposite half of the brain. The purpose of the optic chiasm is to ensure that visual signals go to both hemispheres of brain. The majority of neural signals are sent to the thalamus for processing and are then distributed into areas of the occipital lobe. The neural signals are then received by the visual cortex (the ultimate destination for visual input), which is located at the occipital lobe. There, feature detectors assist us in interpreting what it is we are actually seeing as they respond to specific features of the object before us. These specific cells will fire as we encounter various shapes or movements.

Responses may vary but should include some or all of the following information: The trichromatic theory of color vision states that humans have three types of receptors within the eye that vary in sensitivity to different light wavelengths. The three receptors are usually associated with the colors red, green, and blue. People can see a variety of colors because the eye mixes colors together by varying activity among the three receptors.