The aim of this study is to demonstrate the spectrum of conditions encompassed by the term 'trachomatous
cicatrization of eyelid tissue', to discuss the mechanisms of
scar tissue formation and to describe sequelae in this potentially blinding condition. Specimens of eyelid tissues were taken from 27 upper eyelids of 21 patients with
entropion who underwent
surgical procedures and 2 post-mortem upper eyelids with severe trachomatous
entropion. Upper palpebral conjunctival swabs and biopsy specimens were taken from 5 patients with active
trachoma and they were examined by fluorescence microscopy and routine histopathological methods. Conjunctival impression cytology samples were collected in all patients. In specimens taken from patients with active
trachoma the inflammatory infiltrate was organized as lymphoid follicles in the underlying stroma and impression cytology showed cytoplasmic elementary bodies. In specimens taken from patients with
scarring trachoma light microscopy studies showed subepithelial fibrous membrane formation, squamous
metaplasia and loss of goblet cells, pseudogland formation in conjunctiva, degeneration of orbicularis oculi muscle fibres, subepithelial vascular dilatation, localized perivascular
amyloidosis and subepithelial lymphocytic infiltration. Accessory lachrymal glands and the ducts of glands were compromised by subepithelial infiltration and
scarring. The contraction of the subepithelial fibrous tissue formed by
collagen fibres and anterior surface drying are the main factors contributing to the chronic
cicatrization and
entropion formation.