Meibomian gland dysfunction and contact lens intolerance

Area of Science:

• Ophthalmology
• Ocular Surface Disease
• Meibomian Gland Dysfunction

Background:

• Meibomian gland dysfunction (MGD) is a common cause of evaporative dry eye.
• Symptoms of MGD can range from mild to severe, impacting ocular comfort and vision.
• Contact lens intolerance is a frequent complaint associated with MGD.

Purpose of the Study:

• To investigate a specific syndrome characterized by inadequate Meibomian gland secretions.
• To elucidate the underlying mechanisms causing ocular dryness and contact lens intolerance in affected individuals.
• To understand the role of epithelial cell obstruction and bacterial proliferation in this syndrome.

Main Methods:

• Clinical examination of patients presenting with dry eye symptoms and contact lens intolerance.
• Cytologic analysis to identify cellular changes within the Meibomian gland orifices.
• Fluorescein staining of the cornea to assess ocular surface integrity.

Main Results:

• The syndrome is characterized by deficient Meibomian gland secretions and minimal or transient dry eye symptoms.
• Corneal fluorescein staining, often subtle, indicates ocular surface damage.
• Histological findings reveal obstruction of Meibomian gland orifices by aggregated, desquamated epithelial cells (keratotic clusters).
• Bacterial proliferation within these clusters can lead to the release of toxins into the tear film.

Conclusions:

• Obstruction of Meibomian gland orifices by desquamated epithelial cells is the primary cause of this syndrome.
• This obstruction alters the Meibomian glands' contribution to the tear film, leading to ocular dryness.
• Bacterial contamination of the obstructed glands exacerbates the condition, potentially causing further ocular surface damage.