Sepsis can damage nearly every structure in the eye, from the surface of the cornea to the retina and optic nerve. The mechanisms range from bloodborne pathogens physically seeding the interior of the eye to widespread microvascular shutdown that starves retinal tissue of oxygen. In one cross-sectional study of ICU patients, roughly a third had retinal lesions consistent with disseminated infection, and many of those findings had gone unnoticed before a formal eye exam. Because sepsis patients are often sedated and unable to report visual symptoms, eye complications can progress silently, making awareness of these risks unusually important for families and clinicians alike.
How Sepsis Reaches the Eyes
The eye is normally well-protected from circulating infections by a structure called the blood-ocular barrier, which works much the way the blood-brain barrier shields the central nervous system. In healthy people, this barrier is remarkably effective: only a tiny fraction of pathogens that enter the bloodstream manage to cross into the interior of the eye and establish an infection there. But sepsis disrupts that protection in two overlapping ways. First, the overwhelming inflammatory response damages blood vessel linings throughout the body, including the fine capillaries that supply the retina and the tissues around the optic nerve. Second, the sheer volume of bacteria or fungi circulating in the blood during severe sepsis increases the odds that some organisms will breach the barrier and gain a foothold inside the eye.
The retina’s blood supply shares regulatory mechanisms with the brain’s blood supply, and both become impaired during sepsis. Normally, the body adjusts blood flow to the retina and brain automatically to maintain a steady oxygen supply even when blood pressure fluctuates. In sepsis, that self-regulation breaks down, leaving the retina vulnerable to swings in perfusion pressure. The result is that parts of the retina can become temporarily or permanently starved of blood flow, even when systemic blood pressure is being managed in the ICU.
Endogenous Endophthalmitis
The most devastating eye complication of sepsis is endogenous endophthalmitis, an infection that develops inside the eye itself when pathogens traveling through the bloodstream cross the blood-ocular barrier and begin multiplying in the vitreous humor or surrounding tissues. This occurs in a small but meaningful fraction of patients with bloodstream infections, with estimates ranging from roughly 0.04% to 0.5% of people with bacteremia or fungemia.1PubMed Central. Endogenous Endophthalmitis: yield of the diagnostic evaluation That may sound low, but given the hundreds of thousands of sepsis cases treated annually, endogenous endophthalmitis represents a significant number of eyes at risk.
Symptoms typically include eye pain, redness, and rapidly declining vision, but in sedated or critically ill patients these signs can go undetected. The infection can progress quickly enough to destroy the internal structures of the eye within days if untreated, sometimes leading to permanent blindness or even loss of the eye. Early recognition depends on clinicians thinking to look for it, which is part of why recent reviews have called for routine bedside eye exams in ICU patients with sepsis.
When Fungal Infections Are the Culprit
Candida and other fungi are particularly common causes of endogenous endophthalmitis, especially in patients who have central venous lines, are receiving intravenous nutrition, have diabetes, or are on immunosuppressive medications. A study examining clinical features that predict fungal endophthalmitis found that having an indwelling intravenous line, a sepsis episode within the past six months, complicated diabetes, actively treated cancer, and current immunosuppression were all significantly associated with the condition.2PubMed. Outcomes and Clinical Features Predictive of Fungal Endophthalmitis A hepatitis C diagnosis also raised the odds.
Fungal endophthalmitis deserves special attention because it behaves differently from bacterial cases. Pain and vision loss tend to develop more gradually, sometimes over days to weeks rather than hours. That slower onset can be deceptive, making the condition look less urgent when in fact the window for effective treatment is narrowing. Standard systemic antifungal therapy does not always penetrate the eye well enough to clear the infection, which is why direct injection of antifungal medication into the vitreous is often necessary. In some patients, systemic antifungal agents carry their own toxicity risks, further complicating treatment decisions.3PubMed. Intravitreal liposomal amphotericin B for treatment of endogenous candida endophthalmitis
Retinal Damage Without Direct Infection
Even when bacteria or fungi never actually enter the eye, sepsis can damage the retina through its effects on blood vessels. Septic retinopathy refers to a range of microvascular lesions, including tiny hemorrhages, cotton-wool spots (areas where nerve fibers in the retina have swollen because their blood supply was interrupted), and microaneurysms in retinal capillaries. These changes are driven by the same inflammatory and clotting cascade that damages small blood vessels throughout the body during sepsis.
In a cross-sectional study of 73 ICU patients, about 34% had retinal lesions consistent with disseminated bacterial infection. Of those, roughly half had findings clearly linked to sepsis, while the other half had coexisting conditions like diabetes or hypertension that could also explain the retinal changes.4PubMed Central. The prevalence of retinal lesions in septic ICU patients – a cross-sectional, observational study That overlap makes diagnosis tricky. A retinal hemorrhage in a septic patient with diabetes could be from either condition or both. It underscores the challenge clinicians face in sorting out what is specifically sepsis-driven versus pre-existing eye disease that happens to coexist.
A related but rarer pattern resembles Purtscher retinopathy, a condition originally described after severe head trauma. In sepsis, complement activation can trigger the formation of small clots made of clumped white blood cells and platelets, which block tiny arterioles feeding the retina. The resulting areas of whitened, ischemic retina, sometimes called Purtscher flecken, represent patches of tissue that have lost their blood supply.5PubMed Central. Purtscher-like retinopathy: A rare ocular finding in nephrotic syndrome These lesions can cause sudden visual field defects if they involve the central retina.
Corneal Exposure in the ICU
Not all eye damage during sepsis comes from inside the body. One of the most common and most preventable eye problems in critically ill patients is exposure keratopathy, which occurs when the surface of the cornea dries out and breaks down because the eyelids are not closing properly. Sedation, mechanical ventilation, and paralytic medications all reduce the blink reflex, and fluid shifts in sepsis can cause chemosis (swelling of the conjunctiva), which physically prevents the eyelids from meeting. Some patients develop lagophthalmos, where the lids remain partially open even during sleep or sedation.
A systematic review and meta-analysis examining exposure keratopathy in critically ill patients identified several risk factors: lagophthalmos, chemosis, a very low blink rate, mechanical ventilation, sedation, and greater overall illness severity.6PubMed Central. Prevalence and risk factors of exposure keratopathy among critically ill patients: A systematic review and meta-analysis A single-center study in Jordan found that more than 42% of sedated or ventilated ICU patients developed exposure keratopathy, with chemosis and lagophthalmos being the strongest predictors. Remarkably, fewer than 1% of the patients in that study had their eyes taped shut as a preventive measure.7PubMed Central. Characteristics and associated risk factors of exposure keratopathy among ventilated patients in intensive care units in Jordan
That last detail highlights a real gap in ICU care. Eye protection in sedated patients is a straightforward intervention: lubricating drops, moisture chambers, or taping the lids closed can substantially reduce the risk. Yet eye care is often a low priority when teams are managing life-threatening organ failure. When the cornea dries out and ulcerates, the resulting scarring can impair vision long after the patient has recovered from sepsis itself.
Optic Nerve Injury
Sepsis can also damage the optic nerve, the cable that carries visual information from the retina to the brain. Anterior ischemic optic neuropathy occurs when blood flow to the front of the optic nerve drops below what the tissue needs to survive. In sepsis, this is most likely triggered by prolonged low blood pressure reducing perfusion to the small arteries supplying the optic disc. Patients who already have vascular risk factors or a particular optic disc anatomy sometimes described as a “disc at risk” are more susceptible.8PubMed Central. Preservation of Vision after Early Recognition of Anterior Ischemic Optic Neuropathy in a Patient with Sepsis
The presentation is typically sudden, painless vision loss in one eye, often with a characteristic pattern of visual field loss. If recognized early, treatment focuses on restoring adequate blood pressure and oxygenation, which can sometimes preserve remaining vision. But in a critically ill patient who cannot describe their symptoms, this diagnosis is easy to miss until the damage is irreversible.
Pupillary Changes and Brain Dysfunction
Sepsis frequently causes brain dysfunction, often called sepsis-associated encephalopathy, and the eyes provide a window into that process. The pupils are controlled by brainstem pathways that can be disrupted when sepsis-driven inflammation affects the central nervous system. Clinicians have long used pupil responses as a crude indicator of brain function in critically ill patients, but newer automated pupillometry tools allow more precise measurement.
Research has shown that septic patients with impaired brain blood-flow regulation have measurably slower pupil dilation compared to those with intact regulation. In one study, the speed at which the pupil dilated after a light stimulus was significantly reduced in patients whose cerebral autoregulation was compromised, and automated pupil measurements correlated with estimates of intracranial pressure.9PubMed Central. Automated Pupillometry as an Assessment Tool for Intracranial Hemodynamics in Septic Patients These findings reflect the broader connection between cholinergic pathways, brainstem function, and the pupillary abnormalities seen in sepsis.10Minerva Anestesiologica. Prognostic role of automatic pupillometry in sepsis: a retrospective study
For families visiting a loved one in the ICU, unequal or sluggish pupils can be alarming. It helps to know that these changes often reflect the systemic effects of sepsis on the brain rather than a new neurological emergency, though they always warrant medical evaluation.
Bleeding on the Surface of the Eye
Sepsis frequently triggers disseminated intravascular coagulation, a condition where the body’s clotting system goes haywire, simultaneously forming small clots in blood vessels while depleting the clotting factors needed to stop bleeding elsewhere. One visible result can be subconjunctival hemorrhage, a bright red patch of blood spreading under the clear membrane covering the white of the eye. While subconjunctival hemorrhages happen for many benign reasons, in the context of sepsis they often signal a serious underlying coagulopathy.
A case report of a patient presenting with septic shock documented a left conjunctival hemorrhage alongside a severely deranged clotting profile, including a platelet count well below normal and markedly prolonged clotting times.11PubMed Central. Thromboelastometry‐guided blood transfusion in septic shock complicated with disseminated intravascular coagulation: a case report The hemorrhage itself was not the threat; it was a visible marker of the catastrophic clotting disorder happening everywhere else in the body. In septic patients, visible eye bleeding should prompt a closer look at coagulation status if it has not been checked recently.
Using the Eyes to Monitor Sepsis Severity
One of the more promising developments in sepsis research involves flipping the question around: instead of asking how sepsis damages the eyes, researchers are asking whether examining the eyes can reveal how severe the sepsis is and whether treatment is working. The retina is the one place in the body where doctors can directly observe a microvascular bed without cutting into tissue. That makes it a potential real-time window into the state of the body’s smallest blood vessels during sepsis.
Optical coherence tomography angiography, a non-invasive imaging technique, can map blood flow in the retina with remarkable detail. A review of the technology’s role in sepsis monitoring described it as a functional, non-invasive, real-time biomarker that could complement traditional measures of organ perfusion.12PubMed Central. Optical coherence tomography angiography as a surrogate marker for end-organ resuscitation in sepsis: A review A 2025 study found that retinal blood flow in septic patients was roughly 37% lower than in other ICU patients without sepsis, and nearly 60% lower than in healthy volunteers. Critically, retinal perfusion recovered in patients who survived, and it correlated with organ failure scores, suggesting that the retina genuinely tracks systemic microvascular health.13Ophthalmology Science. Retinal Perfusion and Injury in Sepsis and after Major Surgery
Animal research has reinforced the connection. In an experimental model, researchers observed that microcirculatory blood flow dropped significantly in the conjunctiva within hours of the onset of sepsis, mirroring similar declines in the gut and under the tongue.14PubMed Central. Early course of microcirculatory perfusion in eye and digestive tract during hypodynamic sepsis The eye’s accessibility makes it attractive as a monitoring site: unlike the gut, you do not need a scope or surgical access. This remains an area of active research rather than routine clinical practice, but the trajectory suggests that eye-based monitoring could eventually become a standard part of sepsis management.
The Case for Routine Eye Screening
Given the range of eye complications sepsis can cause, a growing body of opinion supports incorporating routine bedside eye exams into sepsis care protocols, particularly for ICU patients. A scoping review of ocular features in sepsis specifically recommended that all patients with fungemia or unexplained fever accompanied by visual changes receive prompt eye assessments, and that collaborative care between eye specialists and critical care teams could improve both visual and systemic outcomes.15PubMed Central. Ocular features in sepsis – a scoping review
The challenge is practical. ICUs are high-pressure environments with competing priorities, and ophthalmology consultations may not be readily available at all hours. Portable fundus cameras and handheld retinal imaging devices have made bedside exams more feasible, but they are not universal. Until screening becomes standardized, families and patients recovering from sepsis should know that eye symptoms, including blurred vision, floaters, eye pain, or visual field gaps, warrant prompt evaluation even weeks after hospital discharge. Some complications, particularly subtle retinal changes, may not produce symptoms until the damage is advanced.
Neonatal Sepsis and Developing Eyes
Newborns who develop sepsis face a distinct set of risks because their eyes and visual pathways are still maturing. A systematic review examining the long-term neurodevelopmental impact of neonatal sepsis found that sensory outcomes, including vision, were less frequently studied than cognitive outcomes and showed mixed results across different investigations. Some studies included vision assessments as part of broader neurodevelopmental evaluations but did not isolate specific visual outcomes, making it difficult to draw firm conclusions. The review’s authors noted that sensory deficits may be under-recognized and overlooked in follow-up care for children who survived neonatal sepsis.16PubMed Central. The Impact of Neonatal Sepsis on Long-Term Neurodevelopment: A Systematic Review of Cognitive and Sensory Outcomes
This matters for parents of children who had sepsis in the neonatal period. Standard developmental follow-up may focus heavily on motor skills and cognition while giving less attention to subtle visual processing issues. Requesting a comprehensive ophthalmologic evaluation, particularly if a child seems to have difficulty tracking objects, reading, or performing tasks that rely on fine visual discrimination, is a reasonable precaution that available evidence supports but does not yet mandate through formal guidelines.
Distinguishing Sepsis-Related Eye Findings from Other Causes
One persistent difficulty in this field is that many of the retinal changes seen in sepsis, hemorrhages, cotton-wool spots, vascular occlusions, overlap with findings caused by diabetes, hypertension, blood cancers, and other conditions common in ICU patients. As the cross-sectional study mentioned earlier showed, about half of the patients with retinal lesions had at least one other systemic disease that could explain the findings.4PubMed Central. The prevalence of retinal lesions in septic ICU patients – a cross-sectional, observational study Diabetic retinopathy was the most common confounder, followed by hypertensive retinopathy.
This overlap does not mean eye exams are useless in septic patients. It means the findings need to be interpreted in clinical context. New retinal hemorrhages in a patient with no prior history of diabetes or hypertension carry different diagnostic weight than similar-looking hemorrhages in someone with longstanding uncontrolled diabetes. Baseline eye exams at hospital admission, or at least documentation of pre-existing eye conditions, would make it far easier to identify new sepsis-related changes. That kind of baseline data is rarely available in emergency settings, which is one more reason the field is moving toward earlier and more routine ocular assessment in critical care.