Does corneal inflammation cause pupil dilation?

Under normal circumstances, the pupil diameter measures 3–4 mm. When traumatic brain injury or increased intracranial pressure occurs, the pupils dilate; conversely, pupillary constriction may occur in response to toxic reactions. Therefore, monitoring changes in a patient’s pupils provides valuable insight into their clinical condition and enables physicians to initiate appropriate emergency interventions. So, does corneal inflammation cause pupil dilation?

Does corneal inflammation cause pupil dilation?

Corneal inflammation (keratitis) does not cause pupil dilation; rather, patients with keratitis typically exhibit progressive pupillary constriction (miosis). The most common symptoms of keratitis include ocular pain, photophobia, excessive tearing, and eyelid spasm. If the lesion involves the central visual axis, visual acuity loss becomes more pronounced. Classic signs of keratitis include ciliary injection, corneal infiltration, and corneal ulcer formation.

Mydriasis (pupil dilation) is commonly observed in cases of ocular trauma, acute glaucoma, or drug-induced mydriasis. Ocular trauma usually has a clear history of injury; damage to the iris sphincter muscle leads to pupil dilation. Mydriasis associated with acute angle-closure glaucoma is often accompanied by blurred vision, eye pain, ipsilateral headache, nausea, and vomiting—prompt intraocular pressure reduction is essential, and surgical intervention should be considered once intraocular pressure stabilizes.

In daily life, maintain a regular diet—avoid spicy, irritating foods and overeating, and refrain from staying up late. We hope this information is helpful to you.