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High Prevalence of Demodex in Eye Lashes with Cylindrical Dandruff |
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| High Prevalence of Demodex in Eye Lashes with Cylindrical Dandruff |
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作者：高莹莹 文章来源：福建医科大学附属二院，Ocular Surface Center, Miami,FL 点击数：1638 更新时间：2005/4/15 6:06:43 
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| Purpose: To determine the prevalence of demodex in eye lashes with cylindrical dandruff (CD).
Methods: Apply a modified sampling and counting method to 55 clinical cases. Patients were divided in to Group A (n=20) with diffuse CD, Group B (n=12) with sporadic CD, and Group C (n=23) with clean lashes or greasy scales, of which the latter was subdivided in C1 (n=15) without lid hygiene and C2 (n=8) using daily lid hygiene for the past one year. Each patient received routine complete eye examination and modified demodex counting.
Results: Demodex was found in all of Groups A and B patients (n=32) with CD, which was significantly higher than 22% of Group C patients (n=23) without CD (p<0.001). The demodex counts were 4.1 ± 1.0 and 2.0 ± 1.2 per epilated lash with retained CD, which were significantly higher than 0.2 ± 0.5 and 0.2 ± 0.4 per lash without retained CD in Group A and B, respectively (each p<0.001), and than 0.01 ± 0.09 and 0.12 ± 0.41 per lash for Group C1 and C2, respectively (each p<0.001). Demodex was still found in CD fragment left on the lid skin after epilation. 5 Demodex brevis mites were found among the 422 demodex specimens.
Conclusions: Our modified sampling and counting method reveals that prior controversy is resulted from miscounting, and confirmed that lashes with CD is indeed pathognomonic for ocular demodex infestation. Lid hygiene with shampoo reduces demodex counts but does not eradicate demodex.
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