Pterygium with bulbar conjunctival hemorrhages

This study was carried out to describe the clinical features and electron-microscopic characteristics of the capillaries in pterygium with conjunctival hemorrhage. We compared the clinical findings in Japanese and Tunisian primary pterygia and in pterygium with and without bulbar conjunctival hemorr...

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Bibliographic Details
Published in:Graefe's archive for clinical and experimental ophthalmology 1999-06, Vol.237 (6), p.468-473
Main Authors: KRIA, L, AMEMIYA, T, DAKE, Y, OMAR, B, OUERTANI, A. M
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Capillaries - ultrastructure
Conjunctiva - blood supply
Conjunctiva - ultrastructure
Conjunctival Diseases - complications
Conjunctival Diseases - epidemiology
Diseases of eyelid, conjunctiva and lacrimal tracts
Eye Hemorrhage - complications
Eye Hemorrhage - epidemiology
Eye Hemorrhage - pathology
Female
Humans
Hyperemia - epidemiology
Hyperemia - pathology
Japan - epidemiology
Male
Medical sciences
Middle Aged
Ophthalmology
Pterygium - complications
Pterygium - epidemiology
Pterygium - pathology
Tropical medicine
Tunisia - epidemiology
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Summary:This study was carried out to describe the clinical features and electron-microscopic characteristics of the capillaries in pterygium with conjunctival hemorrhage. We compared the clinical findings in Japanese and Tunisian primary pterygia and in pterygium with and without bulbar conjunctival hemorrhages. The capillary fine structures of pterygium with bulbar conjunctival hemorrhages were studied by electron microscopy and compared with those without bulbar conjunctival hemorrhages. Conjunctival hemorrhages were noted in 16.4% of Tunisian patients but not in any Japanese patients. The former pterygia were significantly larger, more vascular and more frequently hyperemic than the latter. Pterygia with bulbar conjunctival hemorrhages were more hyperemic than without hemorrhages. Electron microscopy revealed interruptions of the endothelial cells and basement membrane of the capillaries in the pterygia with bulbar conjunctival hemorrhages, with blood cells escaping through the endothelial interruptions. Conjunctival hemorrhage in pterygia may be caused by fragility of the endothelial cells and basement membrane in the capillaries, which easily induces hemorrhage when the eyes are irritated by rubbing or by conjunctival foreign bodies. Pterygium with conjunctival hemorrhage is more frequently found in Tunisians than in Japanese.
ISSN:0721-832X
1435-702X
DOI:10.1007/s004170050263