DEBS - a unification theory for dry eye and blepharitis

Area of Science:

• Ophthalmology
• Microbiology
• Inflammation

Background:

• Blepharitis and dry eye disease (evaporative and aqueous insufficiency) have historically been considered separate conditions.
• Chronic blepharitis is proposed as the underlying cause of all forms of dry eye disease.
• Bacterial biofilms on the eyelid margin are implicated in the pathogenesis.

Purpose of the Study:

• To reframe dry eye disease as a late manifestation of chronic blepharitis.
• To introduce the term "dry eye blepharitis syndrome" (DEBS) for this unified disease.
• To elucidate the role of bacterial biofilms and their virulence factors in disease progression.

Main Methods:

• Conceptual review and synthesis of existing knowledge on blepharitis, dry eye, and bacterial biofilms.
• Proposal of a four-stage model for DEBS based on anatomical structures and biofilm presence.
• Correlation of clinical manifestations with proposed stages of the disease process.

Main Results:

• Bacterial biofilms on the lid margin persist lifelong, thickening with age and increasing inflammatory virulence factors.
• These virulence factors contribute to follicular inflammation, meibomian gland dysfunction, and aqueous insufficiency.
• A four-stage progression of DEBS is described: folliculitis, meibomitis, lacrimalitis, and lid structure damage.

Conclusions:

• Dry eye is a late-stage manifestation of chronic blepharitis, termed dry eye blepharitis syndrome (DEBS).
• The progression is driven by bacterial biofilm accumulation and associated inflammatory factors.
• Early and routine removal of eyelid margin biofilms via electromechanical debridement is recommended for treatment and prevention.