Vision: Crash Course A&P #18

He only perceived black and white, the afterimage seemed like a negative image, where light replaces darkness. And so those black stars and stripes turned white. So yes, human

vision

is subject to error. But these errors help us understand this wonderfully complex system. Most likely, this beautifully complex system has helped you today to understand the structure and functions of

vision

, starting with the structure of the eye and its three layers: the fibrous, the vascular and the internal. We spend most of our time exploring the inner layer, which consists of the retina and its three types of neurons: photoreceptors, bipolar cells, and ganglion neurons.

After learning the distinction between rods and cones, we explain how this strange visual science trick works. A special thank you to Education Officer Thomas Frank for supporting Crash Course content and free education, and thanks to all of our Patreon patrons who make Crash Course possible with their monthly contributions. If you love Crash Course and want to help us continue making great videos, you can visit patreon.com/

crash

course

to see all the great videos we've prepared for you. The episode was filmed at Dr. Cheryl C. Kinney of Crash Course This episode was written by Kathleen Yale, edited by Blake DePastino and our advisor is Dr.

Brandon Jackson. Our director is Nicola Jenkins, our script supervisor and editor is Nicole Sweeney, our sound designer is Michael Aranda and graphics are done by the Thought Café team.