Eye pain: symptoms and treatment

Eye pain is a symptom, not a definitive diagnosis. According to the International Classification of Diseases, 10th revision, the symptom itself is coded H57.1, meaning "eye pain." However, at the clinical stage, the physician must address a much more important question: whether the pain is associated with damage to the ocular surface, intraocular structures, orbit, optic nerve, or is referred from another area of the face and head. [1]

Eye pain can be superficial or deep. Superficial pain is more often described as burning, stinging, a gritty, scratchy, or foreign body sensation and typically indicates a problem with the cornea, conjunctiva, eyelid, or tear film. Deep pain is more often felt as a dull, aching, drilling, or bursting sensation and is more suggestive of uveitis, scleritis, angle closure attack, optic neuritis, or orbital disease. [2]

In modern triage, one of the most important factors is whether pain affects vision. Clinical guidelines for primary and emergency ophthalmology emphasize that eye pain combined with decreased visual acuity should be considered a more serious condition than simple redness without vision loss. This is because this combination often accompanies keratitis, anterior uveitis, scleritis, orbital infection, and acute angle closure syndrome. [3]

Another fundamental point is that the eye can hurt even with minimal visible changes. Ocular neuropathic pain is described as a diagnosis of exclusion and can cause severe burning, pain, photoalgesia, and a sensation of dryness with very modest objective findings. Therefore, the absence of a bright red eye does not automatically make the complaint "non-serious." [4]

The correct question isn't, "Is it heart, blood pressure, or nerve damage?" but rather, "Can this condition quickly damage vision?" In ophthalmology, this approach is considered safe: first, vision-threatening causes are ruled out, then more common and less dangerous options are identified. [5]

The table below helps you quickly understand how to perceive eye pain at the onset. It is based on materials from the World Health Organization, recommendations for the initial assessment of painful eyes, and current reviews of ophthalmic emergencies. [6]

Clinical sign	What does it mean more often?
Burning, sand, scratching	Most often the problem is with the ocular surface
A dull, deep, aching pain	Most often, damage to the deep structures of the eye or orbit
Pain plus decreased vision	Urgent ophthalmologic evaluation needed
Pain when moving eyes	One must think about optic neuritis, scleritis or orbital process
Pain after chemical contact	Immediate lavage and emergency assistance are required.
Pain in a contact lens wearer	Infectious keratitis must be ruled out.

Why does the eye hurt in the first place and why can the symptoms be so different?

The cornea is one of the most sensitive tissues in the body. A review of ocular neuropathic pain emphasizes that the cornea is extremely densely innervated, and therefore even a small epithelial defect, dryness, or foreign body can cause severe pain. This explains why a small corneal abrasion can sometimes cause more pain than significant conjunctival inflammation. [7]

Superficial pain most often occurs with corneal erosion, dry eye, keratitis, foreign bodies, lens irritation, or chemical exposure. It is characterized by lacrimation, blinking, a foreign body sensation, photophobia, and increased discomfort with each movement of the eyelids over the cornea. This is why patients often describe the eye as "cutting" or "as if scratched." [8]

Deep pain manifests itself differently. It is more often associated with increased intraocular pressure, inflammation of the choroid and sclera, and involvement of the ciliary body, orbital tissue, or optic nerve. This type of pain is often less tolerable, may radiate to the temple, head, or upper jaw, and is often associated with decreased vision or general symptoms, such as nausea and vomiting during an acute attack of angle closure. [9]

Referred pain also occurs. The eye may hurt not because of its own pathology, but because of cluster headaches, sinus pain, trigeminal neuralgia, or other facial pain syndromes. In such cases, an eye examination can be relatively straightforward, but to reach a safe conclusion, it is still necessary to first rule out a true ophthalmologic emergency. [10]

Finally, a special symptom that's easily overlooked is pain without a pronounced red eye. This can be a symptom of optic neuritis, neuropathic eye pain, and some orbital processes. Therefore, complaints of pain with eye movement, changes in color perception, visual field loss, or double vision should never be attributed solely to fatigue or dryness. [11]

The most common causes of eye pain

One of the most common causes remains damage to the corneal epithelium, or corneal erosion. It typically occurs after trauma, the entry of a foreign body, or damage from a nail, branch, paper edge, or contact lens. It is characterized by sharp pain, lacrimation, photophobia, and increased sensitivity to light when blinking. Upon examination, the defect is clearly visible after fluorescein staining. [12]

Infectious keratitis is a more serious form of corneal pain. It can be caused by bacteria, viruses, fungi, and protozoa, and one of the most important risk factors is wearing contact lenses. Keratitis is characterized by pain, photophobia, redness, decreased vision, and corneal clouding or infiltrate. This condition is considered an ophthalmological emergency because delayed treatment can lead to scarring and permanent vision loss. [13]

Dry eye syndrome can also cause genuine pain, not just "inconvenience." The current standard of the American Academy of Ophthalmology describes the chronic course, fluctuating severity of symptoms, and the role of the ocular surface and meibomian glands. Patients most often complain of burning, dryness, a gritty sensation, reflex lacrimation, and eye fatigue. However, the severity of complaints does not always correspond perfectly to the severity of visible changes. [14]

An acute attack of angle closure is one of the most dangerous causes of eye pain. It presents with sudden, severe, one-sided pain, blurred vision, halos around lights, headache, nausea, and vomiting. It is caused by a rapid increase in intraocular pressure, and without prompt treatment, irreversible vision loss is possible. [15]

Anterior uveitis and scleritis cause deeper inflammatory pain. Anterior uveitis typically presents with pain, photophobia, lacrimation, eyelid spasms, and sometimes a small, irregular pupil. With scleritis, the pain is typically deeper, more severe, and often worsens at night and with eye movement. The condition itself is often associated with systemic inflammatory diseases. Both conditions require examination by an ophthalmologist. [16]

Optic neuritis and orbital cellulitis infection are particularly important differential diagnoses when pain is associated with eye movement. Optic neuritis is characterized by acute pain with eye movement, decreased vision, and impaired color perception. Orbital cellulitis infection is characterized by pain with eye movement, bulging of the eye, limited movement, eyelid swelling, and often fever. Both conditions require urgent treatment, but their treatments are fundamentally different. [17]

The table below summarizes the most common causes and the most helpful tips. It is based on clinical guidelines for painful eye, keratitis, dry eye, uveitis, scleritis, and orbital infection. [18]

Cause	How does it usually feel?	What the diagnosis specifically suggests
Corneal erosion	Sharp superficial pain	Increases with blinking and is stained with fluorescein
Infectious keratitis	Pain, photophobia, decreased vision	Contact lenses, corneal infiltrate or ulcer
Dry eye syndrome	Burning, dryness, sand	Chronic course, bilaterality, fluctuation of symptoms
Acute attack of angle closure	Deep, severe pain	Rainbow circles, nausea, cloudy cornea
Anterior uveitis	Pain and photophobia	Small pupil, ciliary injection
Scleritis	A drilling, deep pain	Increased with eye movement, associated with systemic inflammation
Optic neuritis	Pain when moving eyes	Loss of vision and deterioration of color perception
Orbital cellulitis infection	Pain outside and deep in the orbit	Swelling of the eyelid, bulging of the eye, limited movement

Red Flags: When Help Is Needed Today

The main emergency symptom is the combination of pain and sudden vision loss. Clinical guidelines for acute red eye consider this combination to be a key marker of a potentially sight-threatening condition. Situations where pain is accompanied by photophobia, corneal clouding, a fixed, dilated pupil, or severe lacrimation are especially dangerous. [19]

Pain is a very concerning symptom for contact lens wearers, especially if they have photophobia and vision impairment. Contact lenses significantly increase the risk of keratitis, and with a microbial corneal infection, the risk can be immediate. Therefore, the lens should be removed immediately, but the patient should be examined by a specialist immediately, not after a few days. [20]

Chemical contact with the eye is a separate emergency. The main prognostic factor here is how quickly irrigation is initiated. Modern ophthalmological sources emphasize that eye irrigation should begin immediately with any safe, non-toxic solution or even plain water, without attempting to neutralize the chemical with anything of the opposite acidity. [21]

Pain with eye movement, along with eyelid swelling, bulging of the eye, double vision, or limited movement, should raise concerns about orbital infection. This condition is dangerous not only to vision but also to life, as the infection can spread to adjacent structures. Such patients typically require urgent evaluation and systemic therapy. [22]

Finally, pain following intraocular surgery, vitreous injection, or penetrating trauma should be of particular concern. The Royal College of Ophthalmologists (UK) classifies severe pain or vision loss within two weeks of intraocular surgery as an emergency requiring immediate evaluation. This is associated with the risk of endophthalmitis, toxic injury, and other serious complications. [23]

The table below helps quickly identify situations where delay is not an option. It is based on current emergency ophthalmology pathways and guidelines for acute red eye. [24]

Red flag	Why is this dangerous?
Pain plus sudden loss of vision	Risk of keratitis, uveitis, scleritis, neuritis, glaucoma
Pain, rainbow circles, nausea, vomiting	Risk of acute angle closure attack
Contact lenses plus pain and photophobia	Risk of microbial keratitis
Chemical contact	Risk of rapid burning and irreversible damage to the cornea
Pain when moving the eyes, bulging, double vision	Risk of orbital infection
Pain after eye surgery or injection	Risk of endophthalmitis or other serious complication
Penetrating trauma or high-velocity foreign body	Risk of open eye injury

Diagnostics

Diagnosis begins with three basic questions: has vision changed, does the patient wear contact lenses, and has there been trauma or chemical exposure? At this stage, high-risk groups can already be identified. In primary and emergency care, visual acuity testing, pupillary assessment, redness, photophobia, and eye movements are mandatory. [25]

The next step is an examination of the anterior segment of the eye. For safe triage, at least a flashlight, fluorescein staining, and, if possible, a slit lamp are needed. Fluorescein helps visualize erosions, ulcers, dendritic lesions of the cornea, and other epithelial defects. If a foreign body is suspected, it is important to evert the eyelid and inspect the conjunctival fornix. [26]

Measuring intraocular pressure is especially important if an attack of angle closure is suspected. However, tonometry does not replace the clinical picture. If the patient has severe unilateral pain, a cloudy cornea, halos, and nausea, an acute attack of angle closure should be suspected even before obtaining a pressure reading, and ophthalmological care should be urgently sought. [27]

In cases of pain accompanied by vision loss, decreased color perception, and pain with eye movement, evaluation of the optic nerve is paramount. For optic neuritis, testing of the visual field, color vision, and relative afferent pupillary defect is helpful. Magnetic resonance imaging is particularly important for confirming optic nerve inflammation and assessing the risk of demyelinating processes. [28]

If pain is accompanied by eyelid swelling, limited eye movement, bulging, or fever, imaging of the orbit and paranasal sinuses is necessary. Orbital cellulitis infection remains primarily a clinical diagnosis, but computed tomography or magnetic resonance imaging can help confirm the process, assess spread, and decide on surgical intervention. [29]

In patients with prolonged, disproportionately severe pain and few objective findings, the diagnosis may shift to neuropathic pain. This is a diagnosis of exclusion, and therefore, dry eye, eye drop toxicity, keratopathy, uveitis, trauma, contact lens problems, and referred pain must first be ruled out. Only then does a neuropathic mechanism truly become a possibility. [30]

The table below summarizes which studies are particularly relevant to changing management. It is based on guidelines for painful eye, optic neuritis, orbital infection, and acute ophthalmologic triage. [31]

Study	When is it especially useful?	What helps to identify
Visual acuity test	To all patients	Risk of damage to deep structures
Fluorescein staining	For pain, sand, injury, lenses	Erosion, ulcer, keratitis, herpetic defect
Assessment of pupils and light reaction	For pain and deterioration of vision	Neuritis, acute attack of angle closure
Measuring intraocular pressure	If you suspect an angle closure attack	Increased intraocular pressure
Eye movement assessment	For pain in the orbit, swelling of the eyelid, double vision	Orbital infection, neuritis, scleritis
Magnetic resonance imaging	If optic neuritis and orbital process are suspected	Inflammation of the optic nerve, orbital pathology
Microbiological examination	For severe or atypical keratitis	The causative agent of corneal infection

Differential diagnosis

The most common practical question is how to distinguish dangerous corneal pain from conjunctivitis and dry eye. Conjunctivitis is usually characterized by discharge, itching, or irritation, while severe, deep pain and decreased vision are uncommon. Keratitis or corneal erosion are associated with more severe pain, photophobia, lacrimation, and often visual impairment. This is why "red eye" cannot be safely diagnosed without a corneal and vision assessment. [32]

Anterior uveitis and angle-closure attacks can appear similar, as both cause pain, redness, and photophobia. However, uveitis is more often associated with a small or irregular pupil and severe photophobia, while angle-closure attacks typically present with a cloudy cornea, halos, a fixed, dilated pupil, nausea, and a sharp rise in intraocular pressure. [33]

Scleritis and episcleritis also need to be distinguished. Episcleritis typically causes more superficial redness and moderate discomfort. Scleritis causes deep, piercing pain, often impairs vision, and is often associated with a systemic inflammatory disease. This distinction is important because scleritis requires a more thorough investigation of the cause and more intensive treatment. [34]

Optic neuritis and orbital cellulitis infection share common symptoms, including pain with eye movement, but their clinical contexts differ. With neuritis, vision loss, impaired color perception, and sometimes central scotoma are prominent. With orbital infection, eyelid swelling, bulging of the eye, limited movement, double vision, and fever are more common. [35]

Neuropathic eye pain is characterized by complaints that can be disproportionately severe compared to the physical examination. The patient describes a burning sensation, "hot" pain, photoalgesia, dryness, and pain from wind or eye drops, while the physician observes minimal objective changes. This does not indicate malingering. On the contrary, modern reviews emphasize that such patients often go for years without a proper diagnosis because their pain is mistaken for dry eye. [36]

The table below helps quickly categorize the most common causes by clinical features. It is based on current clinical guidelines and reviews on painful eyes. [37]

State	Pain	Vision	Additional signs
Conjunctivitis	Usually moderate	Usually saved	Discharge, itching, bilateral more often
Corneal erosion	Strong superficial	May decrease if there is a defect in the optical zone	Fluorescein positive
Infectious keratitis	Strong	Often reduced	Corneal infiltrate, history of contact lenses
Anterior uveitis	Moderate or strong	May decrease	Photophobia, small pupil
Scleritis	Very strong deep	May decrease	The pain is deeper and more severe, associated with systemic inflammation
Acute attack of angle closure	Very strong	It's getting worse quickly	Rainbow circles, nausea, cloudy cornea
Optic neuritis	Pain when moving eyes	Reduced	Color perception is worse, the field of vision suffers
Orbital cellulitis infection	Orbital pain	May decrease	Bulging, limited movement, fever
Neuropathic pain	Strong, burning	It may be almost normal	Complaints are expressed more than findings

Treatment

Treatment for eye pain is always cause-based. There are no universal "eye drops" for pain, because some conditions require antibiotic therapy, others require lowering intraocular pressure, others require systemic anti-inflammatory drugs, and still others require only intensive lubrication. The most dangerous mistake is trying to treat every painful eye the same way. [38]

In the case of a chemical burn, initial treatment begins immediately at the scene. Immediate and copious rinsing is necessary, removing chemical particles, and continuing irrigation until the patient is referred to specialists. Neither acidic nor alkaline substances should be "neutralized" with an opposing solution, as this can worsen the damage. The sooner irrigation is started, the better the prognosis. [39]

Corneal erosions typically involve infection control, pain relief, and healing monitoring. Contact lens wearers require more stringent surveillance for bacterial contamination, so lens wear is discontinued immediately. In infectious keratitis, the approach is no longer outpatient: the patient requires an urgent examination by an ophthalmologist, and in more severe cases, cultures and immediate initiation of antimicrobial therapy. [40]

In an acute attack of angle closure, the goal is to quickly reduce intraocular pressure and then eliminate the block. Current reviews recommend topical medications, systemic carbonic anhydrase inhibitors, pilocarpine after pressure has been reduced to a safe level, and, as a definitive intervention, laser peripheral iridotomy, which is considered the treatment of choice. This condition is treated urgently, not "on a scheduled basis" [41].

Anterior uveitis is typically treated with topical corticosteroids and cycloplegics, as the latter reduce pain by decreasing ciliary body spasm and help prevent posterior synechiae. Scleritis often requires systemic rather than topical anti-inflammatory agents, beginning with nonsteroidal anti-inflammatory drugs (NSAIDs) and then progressing to oral corticosteroids and more complex therapy as indicated. Both conditions should be treated under the supervision of an ophthalmologist. [42]

Treatment for optic neuritis and orbital cellulitis infection is fundamentally different. Optic neuritis requires neuro-ophthalmological and neurological evaluation, while orbital infection requires hospitalization, intravenous antibiotics, and sometimes surgery. For orbital infection, isolated topical eye drops are insufficient. [43]

Dry eye syndrome and neuropathic pain require a patient, stepwise approach. For dry eye, the American Academy of Ophthalmology describes a stepwise approach with artificial tears, eyelid hygiene, warm compresses, and progressively more severe treatment. For neuropathic pain, the key is recognizing the diagnosis, ruling out other causes, and often incorporating a multidisciplinary approach, as simple relubricating drops don't help everyone. [44]

The table below summarizes the basic modern management for the main causes. It is based on guidelines for keratitis, dry eye, uveitis, scleritis, angle-closure attack, chemical burns, and orbital infection. [45]

Cause	General principle of treatment
Chemical burn	Immediate prolonged irrigation and emergency care
Corneal erosion	Protection from infection, pain relief, healing control
Infectious keratitis	Urgent examination, antimicrobial therapy, culture if indicated
Dry eye syndrome	Artificial tears, eyelid hygiene, warm compresses, step therapy
Acute attack of angle closure	Rapid pressure reduction and laser peripheral iridotomy
Anterior uveitis	Topical glucocorticosteroids and cycloplegics under observation
Scleritis	Systemic anti-inflammatory therapy and search for a systemic cause
Optic neuritis	Urgent neuro-ophthalmologic and neurologic assessment
Orbital cellulitis infection	Hospitalization, intravenous antibiotics, sometimes surgery
Neuropathic eye pain	Diagnosis of exclusion and multidisciplinary tactics

Prevention and prognosis

The most practical way to prevent eye pain begins with contact lenses. The U.S. Centers for Disease Control and Prevention emphasizes that contact lenses themselves are associated with an increased risk of keratitis, and the risk is further increased by sleeping in lenses, poor hygiene, and contact with water. Therefore, avoid sleeping in lenses unless specifically prescribed, rinsing them with tap water, or continuing to wear them if they are painful or red. [46]

The second important measure is protecting the eyes from chemical and mechanical injuries. When working with cleaning agents, solvents, construction mixtures, metal, and wood, protective goggles reduce the risk of the most serious injuries. If chemical contact does occur, the most powerful predictor is not the type of product used, but the speed of rinsing. [47]

For chronic ocular surface pain, systemic prevention of exacerbations is important. For dry eyes, this includes regular moisturizing, eyelid hygiene, correction of adverse external factors, and treatment of meibomian gland dysfunction, if present. Untreated dry eyes not only impair quality of life but can also contribute to chronic pain and increased ocular surface sensitivity. [48]

The prognosis depends primarily on the time it takes to receive proper treatment. Corneal erosion and uncomplicated dry eye usually have a favorable outcome. Infectious keratitis, angle closure attacks, scleritis, orbital infection, and chemical burns are much more serious: late treatment increases the risk of scarring, glaucomatous damage, persistent vision loss, and even loss of the eye. [49]

Finally, a good prognosis is impossible without a proper explanation of the diagnosis to the patient. This is especially important for neuropathic pain, chronic dry eye, and recurrent inflammatory conditions. When a person understands exactly what is happening to the eye, what symptoms are dangerous, and when urgent re-evaluation is needed, the risk of advanced complications is significantly reduced. [50]

The table below summarizes what actually helps reduce the risk of severe cases and recurrences. It is based on current recommendations on lens safety, chemical injuries, dry eye, and emergency ophthalmology. [51]

Preventive measure	Why is it especially important?
Do not sleep in contact lenses unless prescribed.	Prevention of keratitis
Avoid contact of lenses with water	Prevention of bacterial and acanthamoeba infections
Remove lenses immediately if pain occurs.	Early detection of keratitis
Use safety glasses if there is a risk of injury.	Prevention of erosions and penetrating damage
Rinse eye promptly after chemical contact.	Improving the prognosis for chemical burns
Treat dry eye and eyelid dysfunction regularly	Prevention of chronic ocular surface pain
Contact us immediately if you experience pain or vision loss.	Reducing the risk of irreversible vision loss

Frequently asked questions

Can an eye ache simply from dryness, without a serious underlying condition?
Yes, it can. Dry eye syndrome often causes burning, stinging, a gritty sensation, and even quite severe pain. But if the pain is accompanied by deteriorating vision, severe photophobia, or a one-sided, acute symptom, dryness alone cannot explain it. [52]

Is pain with eye movement always optic neuritis?
No. This symptom is indeed very characteristic of optic neuritis, but it can also occur with scleritis, angle closure attacks, and orbital infection. It should be assessed in conjunction with vision, color perception, ocular motility, and the condition of the eyelids and orbit. [53]

Is it possible to wait out a painful red eye at home for 1-2 days?
It depends on the combination of symptoms. If there is severe pain, photophobia, decreased vision, contact lenses, trauma, chemical contact, or nausea with rainbow-colored halos, don't wait. These are the symptoms that are considered red flags in guidelines, requiring urgent examination. [54]

Why are contact lenses so important to ask about?
Because they significantly increase the risk of keratitis. This is one of the first things to ask about a patient with a painful, red eye. For a contact lens wearer, pain, photophobia, and decreased vision are all reasons to suspect a corneal infection until it's ruled out. [55]

What should you do immediately after a chemical eye burn?
Immediately begin prolonged irrigation with water or another safe solution and continue this for as long as possible before transferring the eye to medical personnel. There's no need to search for special neutralizing liquids and there's no time to waste. The speed with which you begin irrigation directly affects the outcome. [56]

If the eye isn't red, could there be a serious underlying cause?
It could. Optic neuritis and neuropathic eye pain sometimes occur without a pronounced red eye. Therefore, the absence of severe redness doesn't rule out a serious problem, especially if the pain is associated with eye movement or is accompanied by vision impairment. [57]

Is it necessary to measure vision for any eye pain?
Yes. Visual acuity testing is considered a mandatory part of the initial evaluation. It is the combination of pain and decreased vision that helps quickly identify patients who require particularly urgent ophthalmological care. [58]

Why is the pain sometimes severe, yet the examination is almost normal?
This is what neuropathic eye pain can look like. It's a diagnosis of exclusion, in which symptoms can be pronounced even with modest visible changes. This condition requires serious consideration, rather than dismissing the complaints as "not real." [59]

Key points from experts

Below are practical guidelines consistent with current guidelines and the scope of work of ophthalmological experts. These are not direct quotes, but clinically accurate conclusions based on current standards and the profile of their professional competence. [60]

Expert	Practical thesis
Michelle K. Rhee, MD, Clinical Professor of Ophthalmology at the Icahn School of Medicine at Mount Sinai, Medical Director of the Cornea and Restorative Vision Bank of New York, and Lead Author of the American Academy of Ophthalmology Guidelines for Bacterial Keratitis	In a patient wearing contact lenses, a painful red eye with photophobia and decreased vision should be considered as possible infectious keratitis until proven otherwise.[61]
Guillermo Amezcua, MD, professor of clinical ophthalmology at the University of Miami, medical director of the Ocular Surface Program at the Bascom Palmer Eye Institute, and author of the American Academy of Ophthalmology dry eye guidelines	Chronic burning and gritty sensations often do indicate ocular surface disease, but disproportionately severe and persistent pain requires thinking more broadly and ruling out a neuropathic mechanism and other causes.[62]
Andrew G. Lee, MD, Chairman of the Blanton Eye Institute at Houston Methodist Hospital and Professor of Ophthalmology, Neurology, and Neurosurgery at Weill Cornell Medical College	Pain with eye movement combined with decreased vision and color vision impairment is a typical set of symptoms that warrants active consideration of optic neuritis rather than relying solely on fatigue or dryness.[63]