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Pterygium with bulbar conjunctival hemorrhages
1Department of Ophthalmology, Nagasaki University School of Medicine, Japan.
Summary
Conjunctival hemorrhages in pterygia are linked to fragile capillaries, especially in Tunisians. This fragility, caused by endothelial damage, leads to bleeding when eyes are irritated.
Area of Science:
- Ophthalmology
- Cell Biology
Background:
- Pterygium is a common eye condition.
- Conjunctival hemorrhage can occur in pterygium cases.
Purpose of the Study:
- To describe clinical features and capillary characteristics in pterygium with conjunctival hemorrhage.
- To compare pterygia between Japanese and Tunisian populations.
- To investigate capillary structures in pterygium with and without hemorrhage.
Main Methods:
- Comparative clinical analysis of Japanese and Tunisian pterygia.
- Electron microscopy of pterygium capillaries with and without hemorrhage.
- Assessment of pterygium size, vascularity, and hyperemia.
Main Results:
- Conjunctival hemorrhages observed in 16.4% of Tunisian pterygia, none in Japanese.
- Pterygia with hemorrhage were larger, more vascular, and hyperemic.
- Electron microscopy showed capillary endothelial and basement membrane interruptions, allowing blood cell leakage.
Conclusions:
- Capillary fragility (endothelial/basement membrane) likely causes pterygium-associated hemorrhage.
- Eye irritation can exacerbate bleeding in fragile capillaries.
- Pterygium with conjunctival hemorrhage is more prevalent in Tunisians than Japanese.