What is the average length of a human eye?

The average length of a human eye is approximately 2.5 centimeters, which is the standard measurement used in anatomy to describe the size of the eyeball. This dimension refers to the anteroposterior length of the eye, which can vary slightly among individuals but tends to average around this measurement in adults. The eye's size is crucial for its function, affecting aspects such as focus and vision clarity. This length ensures that light entering the eye can be correctly focused on the retina, allowing for proper visual processing. The other options represent dimensions that are either too small or not typical for the average human eye, which is why they do not accurately represent the common measurement used in professional and anatomical contexts.