IBD is recognized as a systemic immune-mediated disorder with ocular complications ranging from episcleritis to sight-threatening uveitis, according to a 2026 review in Frontiers in Immunology. A 2016 study by Card et al., United Kingdom, found that over half of uveitis cases (52.2%) were diagnosed prior to IBD diagnosis, highlighting a potential bidirectional relationship.
Link Between Gut and Eye in IBD
IBD patients showed a much higher likelihood of iridocyclitis compared to the matched control group. CD had an OR of 2.87 (95% CI 2.05-4.02). UC had an OR of 2.32 (95% CI 1.79-3.00). A 2016 study by Karmiris et al., Greece, reported that IBD patients had a 2.81-fold increased risk of uveitis compared to the general population (95% CI 2.65-2.98).
Individuals with IBD faced significantly higher risks of ocular extra-intestinal manifestations (EIMs) than the general population. Females showed an OR of 6.3 (95% CI 3.9-10.3). Males had an OR of 3.2 (95% CI 1.6-6.4), according to a 2009 multicenter registry cohort study by Jose et al. in the United States.
Systemic bacterial depletion or colonic reintroduction of normal CRB1 expression can rescue mutation-associated retinal degeneration. This indicates a link between genetic barrier defects and microbiota-driven ocular pathology, as noted in a 2026 study. A Hungarian cohort of 689 IBD patients showed pancreatic autoantibody positivity. This correlated with penetrating disease behavior, perianal disease, and specific EIMs including ocular involvement, supporting the “gut-eye-joint” axis hypothesis.
Biomarker Study Reveals IBD Link
This aligns with findings from a 2016 study by Card et al., United Kingdom, which used diagnostic codes (Read codes) to analyze 56,097 IBD patients and 280,382 controls.
A 2024 study in Sweden found uveitis and Crohn’s disease frequently co-occurred in psoriatic arthritis patients. This supports the “gut-eye-joint” axis hypothesis.
Patients with UC had a higher risk of eye diseases compared to controls (HR, 1.25; 95% CI, 1.20-1.32), as reported in a 2016 study. A study found uveitis strongly associated with severe disease courses in IBD patients. These findings highlight the need for collaboration between gastroenterologists and ophthalmologists to address IBD-related ocular complications.
Consulting qualified healthcare professionals is recommended for individuals experiencing ocular symptoms or concerns about IBD. The evidence underscores the importance of integrating biomarker testing and clinical evaluations to manage systemic immune disorders effectively.
Grace Chen