Which of the following is NOT a symptom of keratitis?

Keratitis is an inflammation of the cornea, and its symptoms are primarily related to visual discomfort and the protective functions of the eye. Symptoms such as excessive tearing, eye pain, and increased sensitivity to light are directly associated with this condition.

Excessive tearing occurs as a response to irritation of the cornea, which can be inflamed or infected. Eye pain is commonly reported due to inflammation, which affects the sensitive nerves in the cornea. Increased sensitivity to light, or photophobia, is another frequent symptom, as light can exacerbate the discomfort caused by the inflamed cornea.

In contrast, a severe headache is not a typical symptom of keratitis. While a headache can occur in conjunction with other eye conditions or be triggered by eye strain or discomfort, it is not a primary indicator of keratitis itself. Therefore, identifying severe headache as not being a symptom of keratitis is accurate, as it does not directly relate to the inflammation or irritation patterns seen in this eye condition.