Ocular symptoms reported by patients infested with Demodex mites

Aleksandra Sędzikowska; Maciej Osęka; Barbara Grytner-Zięcina

doi:10.1515/ap-2016-0112

Article

Ocular symptoms reported by patients infested with Demodex mites

Aleksandra Sędzikowska , Maciej Osęka and Barbara Grytner-Zięcina

Published/Copyright: October 24, 2016

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From the journal Acta Parasitologica Volume 61 Issue 4

Abstract

The purpose of this study was to determine subjective ocular symptoms occurring in patients infested with Demodex. The number of Demodex mites in the obtained material that correlated with the appearance of ocular symptoms was estimated. The study material were eyelashes collected from 1499 patients. The material were observed under a light microscope. T-test, the logistic regression method, and Pearson correlation coefficient were used for the analysis. Demodex mites were detected in 47% patients. The mean ages of infected women and men were 64 and 59 years, respectively. 64% infected patients complained of one or more ophthalmological symptoms. The most commonly reported symptoms included itching (28%), redness of eyelids (21%), and watery eyes (15%). Positive correlation was found between itching, redness, pain, purulence or eyelash loss and the presence of Demodex. The mentioned symptoms increase the probability of Demodex infestation in a statistically significant manner (p<0.005). A correlation between the age and gender and the number of Demodex was revealed by the study. The threshold average number of seven Demodex mites per eight collected eyelashes with which the risk of the occurrence of an ocular symptom increases significantly was defined. In patients with a low number of Demodex mites, symptoms may be absent. The risk of the occurrence of ocular symptom in patients with demodicosis increases with the increase in the average number of Demodex mites.

Keywords: Demodex; demodicosis; ocular symptomsIntroduction

Acknowledgements

We would like to thank Ph.D. Joanna Konieczna-Salamatin for assistance with statistical analysis.

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Received: 2016-7-15

Revised: 2016-7-25

Accepted: 2016-7-27

Published Online: 2016-10-24

Published in Print: 2016-12-1

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https://doi.org/10.1515/ap-2016-0112

Keywords for this article

Demodex; demodicosis; ocular symptomsIntroduction