Paradigm Shift: Homeostasis and Low Biomass

Scientific literature defines the ocular surface as a dynamic, low-biomass ecosystem. Microbial density is regulated by host defense mechanisms and competitive dynamics.

Eubiosis & Microbiotic Core

Characterization via 16S rRNA gene sequencing. Dominant phyla regulate local immune threshold and epithelial health.

Eye Community State Types (ECST)

Stable bacterial configurations ensuring tissue homeostasis despite taxonomic variation between healthy individuals.

Dysbiosis Dynamics

Ecological shift: loss of protective commensals or proliferation of opportunistic pathobionts.

Metabolomics & Barrier

Study of microbial metabolites and their impact on ocular tight junctions and tear film stability.

Analytical Methodology

Challenges related to low biomass and contamination risk (kit-ome). Rigorous protocols and bioinformatics.

Gut-Eye Axis (Systemic)

Lymphocyte migration and circulating metabolites linking gut microbiota to ocular immune response.

Molecular Alterations Overview

Clinical Setting	Alteration Detected	Tissue Correlation
Bacterial Keratitis	Reduced alpha-diversity; NGS opportunistic dominance.	Ulceration risk and barrier failure.
Diabetes (T2DM)	Shift toward Bacteroidetes; Proteobacteria reduction.	Infection susceptibility and delayed healing.
Keratoconus	Detection of Pelomonas and Ralstonia in stroma.	Bacterial corneal biomechanical alterations.

References

Khoo P, et al. (2020). The Ocular Surface Microbiome in Health and Disease. Experimental Eye Research.
Kuo MT, et al. (2019). Ocular Surface Microbiota in Type 2 Diabetes Mellitus. Frontiers in Microbiology.
Wang L, et al. (2021). Diagnostic Information of Bacterial Keratitis via NGS. Front. Cell. Infect. Microbiol.
Zysset-Burri DC, et al. (2017). The role of the gut microbiome in eye diseases. Progress in Retinal and Eye Research.
Del Piccolo L, et al. (2024). Critical insights into the ocular surface microbiome. The New Microbiologica.
Borroni D, et al. (2023). Ocular Surface Microbiota in Naïve Keratoconus. Journal of Clinical Medicine.
Ozkan J, et al. (2017). The Ocular Surface Microbiome with 16S rRNA Sequencing. IOVS.

ocular microbiota test, 16S rRNA ocular sequencing, ocular dysbiosis research, systemic ophthalmology science.

Ocular Microbiome & Metagenomics