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Kohlerâs disease is a rare condition in which the tarsal navicular bone (a bone in the arch of the foot) becomes inflamed. This bone disease is named after the German radiologist who described the condition in the early twentieth century. Kohlerâs disease usually affects children between the ages of three and five. It occurs more commonly in boys than in girls, and is often unilateral, affecting one foot. It is described as an avascular necrosis, or osteonecrosis, in which bone tissue deteriorates due to an interruption of blood supply.
Juvenile macular degeneration (JMD) is the term for several inherited and rare diseases that affect children and young adults. They include Stargardt's disease, Best disease, and juvenile retinoschisis. They can cause central vision loss that often starts in childhood or young adulthood. These conditions come from gene changes passed down in families.