Which option describes a common symptom that might indicate the need for an eye exam?

A persistent headache is a common symptom that could indicate the need for an eye exam due to several factors. Headaches can be a direct result of eye strain or vision problems, such as uncorrected refractive errors (like nearsightedness or farsightedness) and issues related to astigmatism. When the eyes are not properly aligned or cannot focus adequately, the muscles around the eyes may become fatigued, leading to unexplained headaches. Additionally, headaches can also be symptoms of more serious conditions related to vision or overall eye health, making it prudent to seek a comprehensive eye examination. Other symptoms, while they may indicate health issues in their respective areas, do not specifically point towards the need for an eye exam in the same direct manner as persistent headaches.