There are two basic types of Macular Degeneration: âdryâ and âwet.â Approximately 85% to 90% of the cases of Macular Degeneration are the âdryâ (atrophic) type, while 10-15% are the âwetâ (exudative) type. Stargardt disease is a form of macular degeneration found in young people, caused by a recessive gene.
An Internet Service Provider (ISP) is a company that provides Internet access by using copper, fiber, or even satellite communications to the customer. In this lesson, we will cover exactly what an ISP is, how the ISP connects customers, and what type of services the ISPs provide.
However, the situation is more complex than simply a single connection established to an upstream ISP. ISPs may have more than one point of presence (PoP), which is an access point to the Internet comprised of a physical location housing servers, routers, ATM switches and digital/analog call aggregators. Some ISPs have thousands of PoPs. Multiple PoPs may have separate connections to an upstream ISP.