Satoshi Hashimoto

In the human body, the eyeball is the organ most used to measure objects. In a sense, the ultimate blind spot for observation is the eyeball, the tool of observation. More than half of the eyeball is hidden, buried in the face. How big is the actual size of an eyeball? Many might imagine something similar to a golf ball (43 mm). Compared to other body parts, eyeballs do not differ so greatly in size between individuals, and those of an adult are about 23-24mm in diameter. This is about the same size as a 25 cent coin, the most used coin in the US.