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What is Eye Pain?
Eye pain is a symptom shared by many different conditions. Sometimes the problem starts directly in the eye; in other cases, pain perceived “in” or “behind” the eye may actually be referred from nearby structures such as the sinuses, nerves, blood vessels, or brain.
Whether the pain affects the left eye, the right eye, or both eyes, doctors often distinguish it according to its perceived location:
-
Superficial eye pain, involving the outer eye structures, is often described as:
- sharp,
- stabbing,
- cutting,
- scratchy,
- or “like sand in the eye”.
-
Deep eye pain, felt behind or inside the eye, is more often described as:
- throbbing,
- oppressive,
- aching,
- dull,
- or deep and lancinating.
Superficial pain is commonly associated with a foreign body, corneal irritation, dry eye, or infection. However, severe eye pain, especially when associated with vision changes, should always be considered potentially serious until assessed by a doctor.
Although many cases of eye discomfort resolve spontaneously, it is always advisable to identify the underlying cause, ideally through an examination by an ophthalmologist. This is especially important because some eye diseases can progress rapidly and may threaten vision if treatment is delayed.
Causes
In many cases, eye pain is temporary, non-specific, and improves within a short time. In other situations, ocular pain may be accompanied by other eye-related symptoms, such as:
- red eyes,
- excessive tearing,
- blurred vision,
- protrusion of the eye,
- eyelid swelling,
- light sensitivity,
- discharge,
- foreign body sensation.
When these symptoms are present, the pain is more likely to originate from structures of the visual system itself, especially:
- the cornea, the transparent front surface of the eye covering the iris and pupil; it is richly supplied with nerve endings and therefore highly sensitive to pain;
- the conjunctiva, the thin membrane lining the inside of the eyelids and covering the front of the white part of the eye.
Common eye-related causes of pain include:
- conjunctivitis,
- uveitis,
- corneal ulcers,
- chemical burns,
- ophthalmic herpes zoster,
- keratitis caused by:
- herpes simplex,
- contact lenses,
- glaucoma,
- optic neuritis,
- eye trauma,
- allergies.
Below are the most clinically relevant causes explained in more detail.
Conjunctivitis
Conjunctivitis is inflammation of the conjunctiva and may be viral, bacterial, allergic, or irritative. It often causes redness, tearing, burning, itching, and discharge. Pain is usually mild to moderate rather than severe.
Viral conjunctivitis is frequently associated with cold-like symptoms and watery discharge, while bacterial conjunctivitis more often causes thicker yellow-green discharge. Allergic conjunctivitis usually causes intense itching and affects both eyes.
Corneal Abrasion, Foreign Body, and Corneal Ulcer
The cornea is one of the most pain-sensitive tissues in the body. Even a tiny scratch can cause intense discomfort.
Possible triggers include:
- dust, sand, metal fragments, or eyelashes trapped under the eyelid,
- accidental scratching,
- improper contact lens use,
- exposure to chemicals,
- severe dry eye.
Symptoms often include sharp pain, tearing, blinking discomfort, light sensitivity, and the sensation that something is stuck in the eye.
A corneal ulcer is a more serious condition, often infectious, and requires urgent ophthalmological evaluation, especially in contact lens users.
Keratitis
Keratitis is inflammation of the cornea. It may be caused by viruses, bacteria, fungi, parasites, dry eye, or contact lens misuse.
Contact lens-related keratitis is particularly important because it can progress rapidly and threaten vision. Warning signs include severe pain, redness, blurred vision, light sensitivity, and discharge.
Uveitis
Uveitis is inflammation of the uvea, the middle layer of the eye. It may be associated with infections, autoimmune diseases, inflammatory disorders, or sometimes no identifiable cause.
Typical symptoms include:
- deep aching eye pain,
- redness around the cornea,
- blurred vision,
- floaters,
- marked light sensitivity.
Uveitis requires medical treatment because untreated inflammation can damage internal eye structures.
Acute Glaucoma
Most forms of glaucoma are chronic and painless, but acute angle-closure glaucoma is an emergency. It occurs when the drainage angle of the eye suddenly closes, causing a rapid rise in intraocular pressure.
Symptoms may include:
- severe eye pain,
- headache,
- nausea or vomiting,
- blurred vision,
- halos around lights,
- red eye,
- a fixed or mid-dilated pupil.
This condition can cause permanent vision loss if treatment is delayed.
Optic Neuritis
Optic neuritis is inflammation of the optic nerve. It often causes:
- pain behind the eye,
- pain worsened by eye movement,
- reduced vision,
- altered color perception,
- sometimes flashing lights or visual field defects.
It may occur in isolation or be associated with neurological conditions such as multiple sclerosis.
Chemical Burns and Trauma
Chemical exposure, blunt trauma, penetrating injuries, or high-speed foreign bodies are urgent situations. Even if symptoms initially appear mild, eye damage can worsen quickly.
Chemical burns require immediate irrigation with clean water or saline and urgent emergency care.
Allergies and Dry Eye
Allergies and dry eye usually cause irritation more than true severe pain, but they can be very uncomfortable. Symptoms include burning, itching, foreign body sensation, redness, and tearing.
Dry eye may paradoxically cause excessive tearing, because the eye reacts to irritation by producing reflex tears.
Eye Pain and Headache
In some cases, pain perceived in the eye is actually referred pain from a condition that affects the head, nerves, sinuses, or blood vessels. These situations are often associated with headache.
Possible causes include:
- inflammation of the trigeminal nerve,
- sinusitis,
- cluster headache,
- migraine,
- ophthalmic migraine.
These conditions may present differently:
-
Trigeminal neuralgia usually affects one side of the face. Pain may also be felt on the lips, gums, jaw, or tongue and can be triggered by simple actions such as brushing teeth, chewing, speaking, or touching the face. It causes brief, repeated, severe stabbing pains.
-
Sinusitis may cause pain on one or both sides of the face and is often concentrated around the eyes, cheekbones, forehead, or sides of the nose. It may worsen when bending forward and is often associated with nasal congestion or purulent nasal discharge.
-
Cluster headache causes extremely severe one-sided pain centered around or behind one eye. It is often associated with tearing, red eye, nasal congestion, eyelid swelling, and restlessness. Attacks occur in clusters over days or weeks.
-
Migraine often causes one-sided head pain involving the front or side of the head and may be associated with nausea, vomiting, sensitivity to sound, and photophobia.
-
Ophthalmic migraine is less common and is associated with visual symptoms, sometimes including temporary loss of vision in one eye. Any new episode of visual loss should be assessed urgently to exclude vascular or retinal causes.
When to Worry
Eye pain is often caused by superficial irritation, producing a sensation of scratching, burning, or sand in the eye. However, some associated symptoms may indicate a more serious condition.
Seek urgent medical care if eye pain is associated with:
- vomiting,
- fever,
- chills,
- fatigue,
- muscle aches,
- halos around lights,
- reduced visual sharpness,
- blurred or distorted vision,
- sudden vision loss,
- protrusion of one eye,
- inability to move the eye normally in different directions,
- severe headache,
- nausea with eye pain,
- marked sensitivity to light,
- recent eye trauma,
- chemical exposure,
- contact lens use with pain and redness.
When pain is particularly intense, the conjunctiva is red, and one or more of the symptoms above are present, it is important to see an ophthalmologist immediately.
In the event of trauma, suspected penetrating injury, or chemical burn, go to the nearest emergency department without delay.
If eye discomfort is mild, there are no visual changes, no trauma, and no significant associated symptoms, it may sometimes be reasonable to monitor symptoms for 24–48 hours, preferably after telephone advice from a doctor. However, persistent or worsening symptoms should always be assessed.
Diagnosis
Diagnosis is generally made by an ophthalmologist through a careful medical examination.
Medical History
The doctor will collect information about:
- when the pain started,
- whether onset was sudden or gradual,
- pain quality and severity,
- whether pain is superficial or deep,
- whether symptoms affect the right eye, left eye, or both,
- previous similar episodes,
- contact lens use,
- recent trauma,
- exposure to chemicals or sunlight,
- recent eye surgery,
- known eye disease.
The ophthalmologist will also ask about associated eye symptoms, including:
- vision changes,
- foreign body sensation,
- pain with eye movement,
- redness,
- tearing,
- discharge,
- photophobia.
Because eye pain may also originate outside the eye, the doctor may ask about symptoms suggesting other causes, such as:
- aura, typical of migraine;
- fever and chills, which may suggest infection;
- productive cough, purulent nasal discharge, and bad breath, which may suggest sinusitis.
The physician will also consider known medical conditions that can increase the risk of eye pain, including:
- autoimmune diseases,
- multiple sclerosis,
- migraine,
- recurrent sinus infections.
Eye Examination
A complete eye examination may include several specific tests.
Visual Acuity Test
This evaluates how clearly the patient can see at different distances and helps determine whether pain is associated with reduced vision.
Visual Field Test
The patient rests the chin and forehead on a computerized device that presents light stimuli to one eye while the other is covered. The patient presses a button whenever a light appears in the visual field.
This test is especially useful for diagnosing glaucoma and certain diseases of the retina, optic nerve, and central nervous system. Results may be less reliable in patients who are unable to collaborate fully.
Slit-Lamp Examination
During a slit-lamp examination, the patient rests the chin and forehead against an instrument equipped with a focused beam of light. This allows the ophthalmologist to examine the eye in detail.
It is a safe and painless test that allows visualization of:
- eyelids,
- conjunctiva,
- cornea,
- anterior chamber,
- iris,
- lens,
- vitreous,
- and other anterior eye structures.
Fluorescein dye may be applied to the eye to identify corneal abrasions, ulcers, or foreign bodies.
Tonometry
Tonometry measures intraocular pressure using either a contact tonometer or a non-contact air-puff device. It is essential when glaucoma is suspected.
Ophthalmoscopy
Ophthalmoscopy uses an ophthalmoscope to examine the back of the eye, including:
- retina,
- optic disc,
- retinal blood vessels,
- macula.
It is particularly important when optic neuritis, retinal disease, vascular disorders, or neurological causes are suspected.
Additional Tests
Depending on the suspected diagnosis, further investigations may include:
- blood tests for infection or inflammatory disease,
- imaging such as CT or MRI in suspected orbital cellulitis, optic neuritis, tumor, trauma, or sinus-related complications,
- microbiological swabs or cultures in suspected infectious keratitis,
- neurological assessment when nerve-related pain is suspected.
Treatment
Treatment depends entirely on the cause of the eye pain.
In many cases, over-the-counter pain relievers may help control discomfort, such as:
- paracetamol,
- non-steroidal anti-inflammatory drugs (NSAIDs).
For very intense pain, stronger analgesics, including opioids, may occasionally be required under medical supervision.
However, pain control alone is not enough: the underlying cause must be identified and treated appropriately.
General Measures
Depending on the cause, general advice may include:
- avoiding rubbing the eye,
- stopping contact lens use until cleared by a doctor,
- using preservative-free artificial tears for irritation or dry eye,
- applying cool compresses for allergic or inflammatory eyelid symptoms,
- avoiding bright light if photophobia is present,
- seeking urgent care for trauma, chemical exposure, or vision changes.
Contact Lens-Related Pain
If eye pain occurs in a contact lens wearer, lenses should be removed immediately and not reused until an ophthalmologist has evaluated the eye. Contact lens-associated keratitis can progress quickly.
Infections
Treatment depends on the organism:
- bacterial conjunctivitis or keratitis may require antibiotic eye drops;
- herpetic keratitis may require antiviral treatment;
- fungal or amoebic keratitis requires specialist therapy;
- orbital infections may require systemic antibiotics and urgent imaging.
Uveitis and Corneal Conditions
Some corneal diseases and anterior uveitis can indirectly affect the anterior chamber of the eye (the fluid-filled space between the cornea and the iris) and cause spasm of the ciliary muscle. When this muscle spasms, exposure to light can trigger a sudden contraction, worsening pain.
Patients with anterior uveitis or selected corneal diseases may be prescribed a cycloplegic eye drop, such as cyclopentolate, which relaxes the ciliary muscle and dilates the pupil, helping reduce light-induced pain.
These medications must only be used under medical supervision, because they are not appropriate for all causes of eye pain.
Glaucoma
Acute angle-closure glaucoma is an emergency and requires rapid reduction of intraocular pressure using medication and sometimes laser or surgical procedures.
Optic Neuritis
Optic neuritis may require neurological and ophthalmological evaluation. In selected cases, intravenous corticosteroids are used, particularly when there is significant visual loss or suspicion of demyelinating disease.
Chemical Burns
Chemical injuries require immediate irrigation with water or saline before any other treatment. Do not wait for medical assessment before rinsing the eye. After irrigation, urgent emergency care is required.
In all cases, before using medication to relieve eye pain, it is best to consult a doctor who can determine the safest and most appropriate treatment and dosage.
Sources and Bibliography
- MSD Manual - Ocular Pain
- Toselli C., Miglior M. Oftalmologia clinica. Monduzzi. (1979). ISBN 88-323-1601-3
- Buratto L. L’Occhio, Le Sue Malattie E Le Sue Cure. Springer
- Kanski J. Oftalmologia clinica. Elsevier Masson
- Gislin Dagnelie, Visual Prosthetics: Physiology, Bioengineering, Rehabilitation, Springer Science & Business Media, 21 February 2011, p. 398, ISBN 978-1-4419-0754-7. PubMed
