Limbal vernal keratoconjunctivitis in the tropics

Area of Science:

• Ophthalmology
• Immunology
• Pediatrics

Background:

• Vernal keratoconjunctivitis (VKC) is a bilateral, itching, seasonal eye inflammation.
• It primarily affects children and adolescents in tropical and subtropical regions.
• Understanding the specific pathology of VKC in different geographic locations is crucial for effective management.

Purpose of the Study:

• To describe the histopathology of limbal vernal keratoconjunctivitis (VKC) in Kenyan children.
• To characterize the inflammatory infiltrate in affected conjunctival tissues.

Main Methods:

• A case series design was employed.
• Conjunctival biopsy specimens from ten children with active, untreated limbal VKC were analyzed.
• Histological examination included tinctorial and immunocytochemical staining to identify inflammatory cells.

Main Results:

• VKC patients exhibited squamous metaplasia of the tarsal conjunctiva compared to controls.
• Chronic inflammatory cellular infiltration was observed in both limbal and tarsal conjunctiva.
• Tarsal conjunctiva showed T-lymphocyte reactions, B-lymphocyte clusters, mast cells, IgE plasma cells, and eosinophils.

Conclusions:

• The observed pathology in Kenyan VKC patients resembles that in temperate regions.
• A higher degree of B-lymphocyte clustering was noted in tropical VKC.
• Findings support an allergic etiology for VKC, even in the absence of other atopic symptoms.