High Prevalence of Demodex in Eyelashes with Cylindrical Dandruff

• Published in: Investigative ophthalmology & visual science Vol. 46; no. 9; pp. 3089 - 3094
• Main Authors: Gao, Ying-Ying, Di Pascuale, Mario A, Li, Wei, Liu, Daniel Tzong-Shyue, Baradaran-Rafii, Alireza, Elizondo, Antonio, Kawakita, Tetsuya, Raju, Vadrevu K, Tseng, Scheffer C. G
• Format: Journal Article
• Language: English
• Published: Rockville, MD ARVO 01.09.2005; Association for Research in Vision and Ophtalmology
• Subjects: Adult; Animals; Biological and medical sciences; Dermatology; Eye and associated structures. Visual pathways and centers. Vision; Eye Infections, Parasitic - epidemiology; Eyelashes - parasitology; Fundamental and applied biological sciences. Psychology; Hair - parasitology; Hair Diseases - epidemiology; Hair Removal; Humans; Medical sciences; Middle Aged; Mite Infestations - epidemiology; Mites; Prevalence; Skin Diseases - epidemiology; Skin involvement in other diseases. Miscellaneous. General aspects; Vertebrates: nervous system and sense organs; High; Skin disease; Prevalence; Cilium; Scalp; Ophthalmology; Dandruff
• DOI: 10.1167/iovs.05-0275
• ISSN: 0146-0404; 1552-5783

To determine the prevalence of Demodex in eyelashes with cylindrical dandruff (CD). A modified sampling and counting method was applied 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 divided into subgroup C1 (n = 15) without lid hygiene and subgroup C2 (n = 8) using daily lid hygiene for the past year. Each patient underwent a routine complete eye examination and modified counts of Demodex. Demodex was found in all group A and B patients (n = 32) with CD, which was significantly higher than the 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, significantly higher than the 0.2 +/- 0.5 and 0.2 +/- 0.4 per lash without retained CD in groups A and B, respectively (each P < 0.001) and than the 0.01 +/- 0.09 and 0.12 +/- 0.41 per lash in subgroups C1 and C2, respectively (each P < 0.001). Demodex was still found in CD fragments left on the lid skin after epilation. Five Demodex brevis mites were found among the 422 Demodex specimens. The modified sampling and counting method showed that the prior controversy regarding Demodex has resulted from miscounting and confirmed that lashes with CD are pathognomonic for ocular Demodex infestation. Lid hygiene with shampoo reduces Demodex counts but does not eradicate the mites.