What is the most common issue caused by astigmatism?

Astigmatism primarily affects the way light rays enter the eye due to an irregular curvature of the cornea or lens. This irregular shape prevents light from focusing properly on the retina, leading to distorted or blurred vision at various distances. Consequently, individuals with astigmatism often report that their vision is unclear, making it the most prominent symptom of this condition.

Blurred vision can occur both up close and at a distance, which distinguishes astigmatism from other visual impairments that may predominantly affect one range of distance. While the other choices present issues that can be related to various eye conditions or refractive errors, they are not directly linked to the fundamental aspect of astigmatism, which is the distortion caused by light not focusing correctly due to the eye's shape. This focus on blurred vision underscores why it is considered the most common issue associated with astigmatism.