Meibomian gland structure and function in patients with Demodex blepharitis

Area of Science:

• Ophthalmology
• Dermatology
• Microbiology

Background:

• Demodex blepharitis is an ocular condition caused by Demodex mites.
• Meibomian gland dysfunction (MGD) affects the oil glands in the eyelids, leading to dry eye symptoms.
• The relationship between Demodex infestation severity and MGD severity requires further investigation.

Purpose of the Study:

• To compare structural and functional MGD measures in eyes with moderate to severe Demodex blepharitis (collarette grades 2-4) versus mild Demodex blepharitis (collarette grade 0).

Main Methods:

• Retrospective, single-center observational study of adult patients.
• Compared MGD signs including telangiectasia, meibum expressibility, meibum quality, and meibography.
• Analyzed collarette grades 2-4 (moderate to severe) versus grade 0 (mild) Demodex blepharitis.

Main Results:

• Eyes with collarette grades 2-4 showed statistically significant worse telangiectasia, meibum quality, and meibomian gland atrophy scores compared to grade 0.
• A positive correlation was observed between higher collarette grade and increased severity of MGD signs.
• These findings remained significant after adjusting for age.

Conclusions:

• Moderate to severe Demodex blepharitis is associated with significantly worse structural and functional MGD.
• Clinicians should routinely screen for Demodex infestation and MGD.
• Integrated treatment of Demodex and MGD is recommended, particularly in the perioperative period.