What causes people with nearsightedness to see blurry images of objects at a distance?

Nearsightedness, or myopia, occurs when the eyeball is too long or the cornea has too much curvature, causing light rays to focus in front of the retina rather than directly on it. As a result, distant objects appear blurry because the light is not properly focused. This refractive error prevents the eye from clearly processing images at a distance, while close objects can be seen more clearly.