Look Again! Demodex Blepharitis in Closer Focus

Why Demodex blepharitis deserves more attention – and how a quick diagnostic check can improve patient care

January 19, 2026
7 min

The Ophthalmologist

Overview

Demodex blepharitis (DB) is prevalent in a significant portion of patients, particularly those with ocular surface discomfort. Proper identification and management of DB can improve surgical outcomes and patient satisfaction.

Background

Demodex blepharitis has historically been underappreciated in clinical practice, yet it is increasingly recognized for its impact on ocular health, especially in surgical settings. The condition is associated with a higher prevalence of dry eye disease and can complicate cataract surgery outcomes. Understanding and diagnosing DB is crucial for optimizing patient care.

Data Highlights

{'table': [{'study': 'Lockington et al.', 'findings': 'DB identified in 54% of 804 patients screened.'}, {'study': 'Koetting et al.', 'findings': '69.1% prevalence of dry eye disease in DB patients.'}, {'study': 'Chinese review', 'findings': '89.32% rate of Demodex in patients with meibomian gland dysfunction.'}, {'study': 'Polish study', 'findings': '48% of cataract surgery patients had Demodex.'}, {'study': 'Contact lens study', 'findings': '93% of intolerant users had Demodex infections.'}]}

Key Findings

DB is found in approximately 54% of patients during routine examinations.
Patients with DB report symptoms like redness, irritation, and itchiness, especially in the upper lids.
High prevalence of dry eye disease (69.1%) is associated with DB.
Demodex infestation is prevalent in patients with meibomian gland dysfunction (89.32%).
Collarettes at the lash base are a key diagnostic sign of DB.

Clinical Implications

Clinicians should incorporate thorough examinations of the upper eyelids to identify DB, especially in patients presenting with ocular discomfort. Effective management of DB can enhance surgical outcomes and reduce postoperative complications.

Conclusion

Demodex blepharitis is a common yet often overlooked condition that can significantly affect ocular health and surgical outcomes. Increased awareness and proper examination techniques are essential for effective diagnosis and management.