1. About Deafness, 2006. http://deafness.about.com/cs/cochlearimplants/a/cifacts.htm.
2. About Vision, 2006. http://vision.about.com/od/retinitispigmentosa/a/artificialvisio.htm.
3. Advanced Bionics. http://www.cochlearimplant.com/.
4. All About Vision, 2006. http://www.allaboutvision.com/resources/anatomy.htm.
5. American Academy of Ophthalmology, 2006. http://www.aao.org.