Review links blepharitis microbiota dysbiosis to ocular surface disease mechanismsReview links eye surface bacteria changes to blepharitis and dry eye conditions

This narrative review explores the evolving perspective on the role of microbiota dysbiosis and Demodex blooms in ocular surface disease. The scope encompasses conditions such as blepharitis, dry eye syndrome, and corneal neovascularization, aiming to clarify whether these microbial changes are secondary effects or active drivers of pathology. The authors argue that recent evidence suggests these perturbations are 'no longer considered epiphenomena,' indicating a shift toward viewing them as potential contributors to disease mechanisms.

The review synthesizes qualitative arguments regarding possible mechanisms linking dysbiosis to clinical outcomes. It highlights that while the association between microbial imbalance and disease progression is gaining traction, the specific causal pathways remain under investigation. The authors refrain from attributing specific statistical effect sizes or p-values, consistent with the nature of a narrative synthesis rather than a meta-analysis of quantitative trial data.

Significant limitations are acknowledged, including the absence of reported study populations, sample sizes, or specific adverse events. The text does not provide confidence intervals or rigorous certainty measures, reflecting the preliminary nature of the mechanistic hypotheses. Consequently, the practice relevance is framed cautiously; clinicians should interpret these findings as suggestive of potential biological links rather than definitive proof of causation requiring immediate therapeutic changes.