Dry Eye Syndrome: This is a common condition that can cause eye pain, especially if the pain is accompanied by dryness, grittiness, or irritation. It's often related to inadequate tear production or poor tear quality.

Conjunctivitis: This refers to inflammation or infection of the outer membrane of the eyeball and the inner eyelid. It can be caused by viruses, bacteria, or allergens and typically presents with redness, discharge, and pain.
Blepharitis: Inflammation of the eyelids can cause pain, redness, and swelling. It's often associated with a bacterial or demodex mite infestation and can lead to secondary issues like conjunctivitis or keratitis.
Corneal Abrasion: A scratch on the cornea can be very painful and may result from trauma, contact lens use, or foreign bodies in the eye.
Uveitis: Inflammation of the uvea, the middle layer of the eye, can cause pain, sensitivity to light, and vision problems. It can be due to infection, injury, or autoimmune disorders.

Acute Angle-Closure Glaucoma: A medical emergency characterized by sudden, severe eye pain, blurred vision, headache, nausea, and vomiting. It occurs when the drainage channels in the eye are suddenly blocked, leading to a rapid increase in intraocular pressure.
Endophthalmitis: A severe inflammation of the interior of the eye, usually caused by infection. It's a medical emergency that can result from surgery, trauma, or blood-borne infection and requires prompt treatment to preserve vision.
Retinal Detachment: Although often painless, in some cases, it can cause severe eye pain. It's a condition where the retina separates from the back of the eye, requiring immediate medical attention to prevent permanent vision loss.
Optic Neuritis: Inflammation of the optic nerve can cause pain with eye movement, vision loss, and impaired color vision. It can be associated with multiple sclerosis or other conditions and requires prompt evaluation.

Scleritis: A severe inflammatory disease that affects the sclera (the white part of the eye). It can cause intense pain, redness, and tenderness, and is often associated with systemic autoimmune disorders.
Orbital Cellulitis: An infection of the tissues surrounding the eye, which can cause pain, swelling, and protrusion of the eye. It's a serious condition that requires prompt antibiotic treatment.
Trigeminal Neuralgia: A chronic pain condition that affects the trigeminal nerve, which can cause sudden, severe, shock-like pain around the eye. It's more common in older adults and can be triggered by minor stimuli.
Tolosa-Hunt Syndrome: A rare disorder characterized by headache, pain around the eye, and weakness of the muscles around the eye. It's caused by inflammation of the cavernous sinus or superior orbital fissure.