The eyes are the most curious characteristic of the Telescope Goldfish. Their large eyes are set on top of long telescope or cone-like stalks mounted on the sides of its head. On some individuals, these stalks can extend out as far as 3/4 of an inch (19 - 20 cm), but they don't really start to protrude until these fish are about 6 months old.
The Telescope Goldfish are believed to have been first developed in China in the early 1700s when they were named the Dragon Eye Goldfish or Dragonfish. Later in that century, in Japan, they were given the name Demekin, which the Japanese still call them today.