Which of the following is a red flag symptom for eye pain?

Light sensitivity, also known as photophobia, is considered a red flag symptom for eye pain because it can signify a more serious underlying condition affecting the eyes. Conditions that may cause light sensitivity include corneal abrasion, uveitis, or even serious infections like keratitis. When a patient experiences eye pain along with an aversion to light, it warrants immediate evaluation, as these symptoms can indicate a risk for complications if not addressed appropriately.

In contrast, minor irritation, reduced tear production, and frequent blinking could be due to less serious issues such as dry eyes, allergies, or fatigue. While these symptoms are certainly uncomfortable and should not be ignored, they do not typically correlate with the urgent need for medical intervention that accompanies light sensitivity.