Types of goldfish that have oversized eyes include bubble eyes, celestials, telescopes and black moors. A fifth type of large-eyed goldfish is the demekin, which is a cross between the telescope variety and the arch-bodied ryukin variety.
Telescope goldfish have large eyes that protrude from the sides of their heads, while celestials have oversized eyes that point upward instead of sideways. Black moors are similar to telescopes, but have a deep velvety black coloration. Bubble eye goldfish have large fluid-filled sacs underneath their eyes, giving them a bug-eyed appearance. Most goldfish with oversized eyes are prone to eye injuries and require plenty of swimming space with few tank decorations.