What causes pain in the eyeball?

Eye pain may be caused by various factors, including but not limited to the following: 1. Eye strain: Prolonged visual tasks such as staring at computer or mobile phone screens, reading, or writing may lead to fatigue of the eye muscles, causing eye pain. 2. Dry eye: Insufficient tear production that fails to adequately lubricate the eyeball may also result in a painful sensation. 3. Conjunctivitis: Inflammation of the conjunctiva caused by bacterial, viral infections or allergic reactions, often accompanied by redness, itching, and discharge. 4. Blepharitis: Infection or blockage of the eyelash follicles or meibomian glands, resulting in eyelid redness, swelling, and pain. 5. Foreign body sensation: Dust, eyelashes, or other small particles entering the eye can irritate the surface of the eyeball. 6. Glaucoma: Increased intraocular pressure compresses the optic nerve, causing severe eye pain, and may be accompanied by vision loss, nausea, and vomiting. Note: If eye pain persists, is accompanied by vision loss, redness, or discharge, please seek medical attention promptly.