Why can people who have myopia or hyperopia have an astigmatism?

People with myopia (nearsightedness) or hyperopia (farsightedness) can also have astigmatism because these conditions relate to the overall shape of the eye and the curvature of the cornea or lens. Myopia and hyperopia occur when the eye is either too long or too short, affecting focal points. Astigmatism arises when the cornea or lens has an irregular shape, causing blurred vision at all distances. Since these issues can coexist, individuals may experience a combination of these refractive errors.