Perdarahan Subkonjungtiva
Published on May 13, 2026
Risk Factors
Elderly patients, hypertension, anticoagulant/antiplatelet use, coagulopathies, trauma, Valsalva maneuvers (coughing, straining, vomiting, heavy lifting), contact lens wear
Etiology
Rupture of small conjunctival or episcleral blood vessels beneath the bulbar conjunctiva; often spontaneous and idiopathic
Presentation
Painless, bright red patch on the white of the eye noticed incidentally (often by someone else or in the mirror); no visual changes, no discharge
Classic Exam
Well-demarcated, flat, bright red or dark red area on the bulbar conjunctiva; the underlying sclera is not visible through the hemorrhage; conjunctiva is otherwise smooth and non-edematous; pupils are normal and reactive; visual acuity is intact
Diagnostics
Clinical diagnosis; no labs or imaging required in isolated, spontaneous cases; check blood pressure; consider coagulation studies (PT/INR, aPTT, platelet count) only if recurrent or if the patient is on anticoagulants
Management
Reassurance and observation; artificial tears for mild irritation; resolves spontaneously in 2 to 3 weeks; treat underlying cause if identified (e.g., blood pressure control, coagulopathy correction)
Keywords
"Painless red eye," "no change in vision," "bright red patch," "woke up with a red eye," "blood-tinged sclera," "on warfarin/aspirin"
01Pathophysiology
The conjunctiva is a thin, transparent mucous membrane that lines the inner surface of the eyelids (palpebral conjunctiva) and folds back to cover the anterior sclera (bulbar conjunctiva). Beneath this membrane lies a rich network of small, fragile blood vessels. When one of these vessels ruptures, blood leaks into the subconjunctival space, the potential space between the conjunctiva and the sclera. Because the conjunctiva is transparent, the trapped blood is directly visible as a vivid red patch.
The hemorrhage is self-limiting because the subconjunctival space is confined. Blood does not enter the anterior chamber, does not affect the cornea, and does not reach the retina. This is why vision remains completely unaffected and there is no pain, as the conjunctiva itself has minimal sensory innervation on its surface and the blood accumulation does not generate enough pressure to stimulate nociceptors.
The mechanism of vessel rupture is most commonly a sudden rise in venous pressure, as seen with Valsalva maneuvers (forceful coughing, sneezing, straining during defecation, vomiting, or heavy lifting). In elderly or hypertensive patients, chronic vascular wall fragility from arteriosclerotic changes predisposes the conjunctival vessels to spontaneous rupture, even without a clear precipitant. In patients on anticoagulants (warfarin, direct oral anticoagulants) or with underlying coagulopathies, the hemorrhage may be larger and take longer to resolve, but the mechanism is the same.
The blood undergoes a predictable color change during resorption, transitioning from bright red to orange-yellow before clearing entirely, similar to the evolution of a bruise. This process takes approximately 14 to 21 days and requires no intervention.
02Classification and Clinical Manifestation
Spontaneous (idiopathic)
Mechanism
No identifiable cause; presumed minor vessel fragility or subclinical Valsalva
Clinical Features
Painless, unilateral red patch; most common presentation; benign and self-resolving
Valsalva-related
Mechanism
Acute rise in venous pressure from coughing, sneezing, straining, vomiting, or heavy lifting
Clinical Features
History of a precipitating event; often noticed shortly after the episode; may be bilateral in severe bouts of coughing (pertussis, for example)
Hypertension-associated
Mechanism
Chronic vascular wall damage and fragility
Clinical Features
Often recurrent; blood pressure may be elevated on presentation; warrants blood pressure check and follow-up
Traumatic
Mechanism
Direct blunt or penetrating trauma to the eye or orbit
Clinical Features
Must rule out globe rupture and orbital fracture; presence of pain, decreased visual acuity, or 360-degree (circumferential) hemorrhage raises suspicion for open globe injury
Coagulopathy/medication-related
Mechanism
Anticoagulant or antiplatelet therapy; thrombocytopenia; liver disease; inherited bleeding disorders
Clinical Features
May be larger or recurrent; important to review the medication list and check coagulation parameters
Type | Mechanism | Clinical Features |
|---|---|---|
Spontaneous (idiopathic) | No identifiable cause; presumed minor vessel fragility or subclinical Valsalva | Painless, unilateral red patch; most common presentation; benign and self-resolving |
Valsalva-related | Acute rise in venous pressure from coughing, sneezing, straining, vomiting, or heavy lifting | History of a precipitating event; often noticed shortly after the episode; may be bilateral in severe bouts of coughing (pertussis, for example) |
Hypertension-associated | Chronic vascular wall damage and fragility | Often recurrent; blood pressure may be elevated on presentation; warrants blood pressure check and follow-up |
Traumatic | Direct blunt or penetrating trauma to the eye or orbit | Must rule out globe rupture and orbital fracture; presence of pain, decreased visual acuity, or 360-degree (circumferential) hemorrhage raises suspicion for open globe injury |
Coagulopathy/medication-related | Anticoagulant or antiplatelet therapy; thrombocytopenia; liver disease; inherited bleeding disorders | May be larger or recurrent; important to review the medication list and check coagulation parameters |
A critical distinction to internalize: isolated, spontaneous subconjunctival hemorrhage is benign. However, subconjunctival hemorrhage in the setting of trauma must be treated with a high index of suspicion for occult globe injury until proven otherwise.
03Diagnostic Workup
Visual acuity
Role
Screening; must be normal in simple subconjunctival hemorrhage
When to Order
Always, on every patient with a red eye
Blood pressure measurement
Role
Screening for hypertension as an underlying cause
When to Order
Always
Slit-lamp examination
Role
To rule out associated anterior segment pathology (corneal abrasion, hyphema, iritis)
When to Order
When there is a history of trauma, pain, or visual change
PT/INR, aPTT, platelet count, CBC
Role
Evaluate for coagulopathy
When to Order
Recurrent episodes, known anticoagulant use, suspected bleeding disorder, or hemorrhage disproportionate to any reported mechanism
CT orbit
Role
Rule out orbital fracture or retrobulbar hemorrhage
When to Order
Traumatic subconjunctival hemorrhage with suspicion for orbital or globe injury
Test | Role | When to Order |
|---|---|---|
Visual acuity | Screening; must be normal in simple subconjunctival hemorrhage | Always, on every patient with a red eye |
Blood pressure measurement | Screening for hypertension as an underlying cause | Always |
Slit-lamp examination | To rule out associated anterior segment pathology (corneal abrasion, hyphema, iritis) | When there is a history of trauma, pain, or visual change |
PT/INR, aPTT, platelet count, CBC | Evaluate for coagulopathy | Recurrent episodes, known anticoagulant use, suspected bleeding disorder, or hemorrhage disproportionate to any reported mechanism |
CT orbit | Rule out orbital fracture or retrobulbar hemorrhage | Traumatic subconjunctival hemorrhage with suspicion for orbital or globe injury |
Subconjunctival hemorrhage is a clinical diagnosis. In the straightforward scenario of a patient who presents with a painless, bright red patch on the eye, has normal visual acuity, and has no history of trauma, the diagnosis is made on inspection alone. No further testing is needed beyond confirming that visual acuity is intact and checking blood pressure.
The key workup decision on the exam centers on when to investigate further. If the vignette describes a patient with recurrent subconjunctival hemorrhages, the next best step is to check a complete blood count and coagulation panel to screen for an underlying bleeding disorder. If the patient is on warfarin, the question may ask you to check the INR and determine if it is supratherapeutic.
In the trauma setting, the workup shifts entirely. A slit-lamp examination becomes essential to evaluate for corneal injury, hyphema, or lens dislocation. If there is suspicion for globe rupture (e.g., 360-degree subconjunctival hemorrhage, shallow anterior chamber, irregular pupil, decreased visual acuity), the next step is not to apply pressure or perform tonometry but rather to shield the eye and obtain emergent ophthalmology consultation. CT of the orbit may be ordered to assess bony integrity.
04Management and Treatment
Spontaneous, isolated episode
Management
Reassurance and observation
Details
No treatment needed; resolves in 2 to 3 weeks; artificial tears (e.g., carboxymethylcellulose 0.5% drops, 4 times daily as needed) for comfort if mild foreign body sensation is present
Hypertension-associated
Management
Blood pressure control
Details
Optimize antihypertensive therapy; follow up to ensure adequate control
Anticoagulant-associated
Management
Review anticoagulation status
Details
Check INR if on warfarin; adjust dose if supratherapeutic; do NOT stop anticoagulation solely for subconjunctival hemorrhage unless INR is dangerously elevated
Recurrent episodes
Management
Investigate for coagulopathy
Details
Order CBC, PT/INR, aPTT; refer to hematology if results are abnormal
Traumatic with suspected globe rupture
Management
Emergent ophthalmology referral
Details
Place a rigid eye shield (do NOT use a pressure patch); avoid any manipulation, tonometry, or topical medications; administer tetanus prophylaxis and systemic antibiotics as indicated; CT orbit without contrast
Scenario | Management | Details |
|---|---|---|
Spontaneous, isolated episode | Reassurance and observation | No treatment needed; resolves in 2 to 3 weeks; artificial tears (e.g., carboxymethylcellulose 0.5% drops, 4 times daily as needed) for comfort if mild foreign body sensation is present |
Hypertension-associated | Blood pressure control | Optimize antihypertensive therapy; follow up to ensure adequate control |
Anticoagulant-associated | Review anticoagulation status | Check INR if on warfarin; adjust dose if supratherapeutic; do NOT stop anticoagulation solely for subconjunctival hemorrhage unless INR is dangerously elevated |
Recurrent episodes | Investigate for coagulopathy | Order CBC, PT/INR, aPTT; refer to hematology if results are abnormal |
Traumatic with suspected globe rupture | Emergent ophthalmology referral | Place a rigid eye shield (do NOT use a pressure patch); avoid any manipulation, tonometry, or topical medications; administer tetanus prophylaxis and systemic antibiotics as indicated; CT orbit without contrast |
The core management principle is that no direct treatment is required for the hemorrhage itself. The blood resorbs naturally over 2 to 3 weeks through local fibrinolysis and phagocytic clearance. Patients should be counseled that the hemorrhage may appear to spread or change color before it resolves, and this is normal.
Artificial tears can be used for symptom relief if the patient reports a mild gritty sensation, but this is not mandatory. Importantly, topical vasoconstrictors (e.g., naphazoline, tetrahydrozoline) serve no purpose and should not be recommended, as the blood is already extravascular.
The "next best step" logic on the exam typically tests whether you can identify when the hemorrhage is a marker of something more serious. If the vignette gives you an elderly patient on warfarin with a large subconjunctival hemorrhage, the tested concept is checking the INR. If the vignette describes a child with recurrent subconjunctival hemorrhages and easy bruising, the tested concept shifts to screening for a bleeding disorder (von Willebrand disease, ITP, leukemia).
In the trauma scenario, the tested concept is recognizing when subconjunctival hemorrhage is a red flag for globe rupture. The correct next step is never to examine or manipulate the eye further but to shield and refer.
05Differential Diagnosis and Distractors
Conjunctivitis (viral/bacterial/allergic)
Why It Is Similar
Also presents as a "red eye"
Key Discriminator
Conjunctivitis produces discharge (watery in viral, purulent in bacterial, stringy/mucoid in allergic), itching or burning, and diffuse injection rather than a well-demarcated blood patch; subconjunctival hemorrhage has no discharge and no pain
Episcleritis
Why It Is Similar
Red eye that is often mild and self-limiting
Key Discriminator
Episcleritis causes sectoral redness with mild tenderness or discomfort; the redness blanches with topical phenylephrine 2.5%; subconjunctival hemorrhage is painless and does not blanch
Scleritis
Why It Is Similar
Red eye that can appear localized
Key Discriminator
Scleritis produces deep, boring pain that worsens with eye movement, may radiate to the brow or temple; often associated with systemic autoimmune disease (rheumatoid arthritis, granulomatosis with polyangiitis); visual acuity may be affected; the redness has a violaceous (bluish-red) hue
Acute angle-closure glaucoma
Why It Is Similar
Acute red eye
Key Discriminator
Presents with severe pain, nausea/vomiting, mid-dilated fixed pupil, decreased visual acuity, and halos around lights; intraocular pressure is markedly elevated; none of these features are present in subconjunctival hemorrhage
Hyphema
Why It Is Similar
Blood in the eye following trauma
Key Discriminator
Blood accumulates in the anterior chamber (visible as a layered blood level behind the cornea), not under the conjunctiva; associated with pain and decreased visual acuity
Globe rupture
Why It Is Similar
Subconjunctival hemorrhage may be present as a sign
Key Discriminator
Globe rupture is distinguished by 360-degree subconjunctival hemorrhage, irregularly shaped pupil, decreased visual acuity, shallow anterior chamber, and positive Seidel test (fluorescein streaming from a wound site)
Child abuse (non-accidental trauma)
Why It Is Similar
Subconjunctival hemorrhage in a child
Key Discriminator
Consider abuse when the hemorrhage is bilateral, there is no plausible mechanism, other signs of trauma are present (retinal hemorrhages, subdural hematoma, long bone fractures), or the history is inconsistent with the injury pattern
Differential Diagnosis | Why It Is Similar | Key Discriminator |
|---|---|---|
Conjunctivitis (viral/bacterial/allergic) | Also presents as a "red eye" | Conjunctivitis produces discharge (watery in viral, purulent in bacterial, stringy/mucoid in allergic), itching or burning, and diffuse injection rather than a well-demarcated blood patch; subconjunctival hemorrhage has no discharge and no pain |
Episcleritis | Red eye that is often mild and self-limiting | Episcleritis causes sectoral redness with mild tenderness or discomfort; the redness blanches with topical phenylephrine 2.5%; subconjunctival hemorrhage is painless and does not blanch |
Scleritis | Red eye that can appear localized | Scleritis produces deep, boring pain that worsens with eye movement, may radiate to the brow or temple; often associated with systemic autoimmune disease (rheumatoid arthritis, granulomatosis with polyangiitis); visual acuity may be affected; the redness has a violaceous (bluish-red) hue |
Acute angle-closure glaucoma | Acute red eye | Presents with severe pain, nausea/vomiting, mid-dilated fixed pupil, decreased visual acuity, and halos around lights; intraocular pressure is markedly elevated; none of these features are present in subconjunctival hemorrhage |
Hyphema | Blood in the eye following trauma | Blood accumulates in the anterior chamber (visible as a layered blood level behind the cornea), not under the conjunctiva; associated with pain and decreased visual acuity |
Globe rupture | Subconjunctival hemorrhage may be present as a sign | Globe rupture is distinguished by 360-degree subconjunctival hemorrhage, irregularly shaped pupil, decreased visual acuity, shallow anterior chamber, and positive Seidel test (fluorescein streaming from a wound site) |
Child abuse (non-accidental trauma) | Subconjunctival hemorrhage in a child | Consider abuse when the hemorrhage is bilateral, there is no plausible mechanism, other signs of trauma are present (retinal hemorrhages, subdural hematoma, long bone fractures), or the history is inconsistent with the injury pattern |
06Traps and High-Yield Pearls
The most common way students get questions about subconjunctival hemorrhage wrong is by overinvestigating or overtreating a benign condition. When a vignette describes a classic painless red patch with normal vision and no trauma, the answer is reassurance. Students who select "slit-lamp examination" or "urgent ophthalmology referral" for an uncomplicated case are falling into the trap of treating every red eye as an emergency.
The second major trap is failing to investigate when the clinical context demands it. A recurrent subconjunctival hemorrhage, one that occurs in a patient on anticoagulants with a supratherapeutic INR, or one in a child with unexplained bruising requires further workup. The tested competency here is recognizing subconjunctival hemorrhage as a potential window into a systemic condition rather than an isolated ocular finding.
The third and most dangerous trap involves the trauma scenario. When a vignette pairs subconjunctival hemorrhage with decreased visual acuity, an irregular pupil, or a 360-degree hemorrhage pattern, the diagnosis shifts from benign to potentially sight-threatening. The correct answer becomes placing a rigid eye shield and obtaining emergent surgical consultation, not prescribing artificial tears. Students who anchor on "subconjunctival hemorrhage is benign" without reading the full clinical picture will miss globe rupture.
Finally, remember that subconjunctival hemorrhage is never associated with visual changes or pain. If the vignette includes either of these, the diagnosis is something else. This single discriminator is the most reliable way to confirm or exclude subconjunctival hemorrhage on any question.