The Difference in Filaments between Corneal Occlusion and Keratoconjunctivitis Sicca

초록

Purpose: To examine histopathological findings of filamentary keratitis due to corneal occlusion. Methods: We analyzed filamentary keratitis in 11 eyes with corneal occlusion due to blepharospasm, ptosis and paralytic strabismus,11 eyes with keratoconjunctivitis sicca, and 13 eyes with both corneal occlusion and keratoconjunctivitis sicca. The followingprotocols were used for filament analyses: slit lamp examination for counting filament numbers, impression cytology forgrading mucin content, and histopathology (hematoxylin and eosin staining) and immunohistochemistry (with AE1/AE3, MUC1,5AC, 16) for histological analysis. Results: Slit lamp biomicrosopy showed a significantly smaller number of filaments in the corneal occlusion group (11 eyes, 2.7± 1.4) than the keratoconjunctivitis sicca group (11 eyes, 5.1 ± 2.2, p = 0.009). In impression cytology, the standard photographgrade of mucin content was significantly higher in the corneal occlusion group (2.7 ± 0.9) than the keratoconjunctivitis siccagroup (1.9 ± 0.8, p = 0.034). On pathological exam, filaments showed a central filament with peripheral mucin. The central filamentswere composed of core and cortex, and the core contained multiple deformed nuclei. However, the cortex was not stainedby AE1/AE3, MUC1, 5AC, 16. Conclusions: Filamentary keratitis due to corneal occlusion showed a smaller number of filaments and higher mucin content thanfilamentary keratitis induced by keratoconjunctivitis sicca and should be considered during treatment.

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