Prevalence of Demodex mites in eyelashes among people of Oaxaca, Mexico

Vargas-Arzola, Jaime; Reyes-Velasco, Leobardo; Segura-Salvador, Aristeo; Márquez-Navarro, Adrián; Díaz-Chiguer, Dylan L.; Nogueda‐Torres, Benjamín

doi:10.1556/amicr.59.2012.2.10

Cited by 28 publications

(28 citation statements)

References 19 publications

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“…In our study, the prevalence of Demodex infestation in all patients (with and without blepharitis) was 48%, and most of the patients were at the age 70–79 years. It is relatively low, comparing to the results reported by other authors, e.g., Sedzikowska: 77% of infected patients in a group over 70 years [ 24 ], Czepita: 95% of patients aged 71–96 years [ 47 ], and Vargas-Arzola: 64% of patients aged 76–85 years [ 48 ]. In a study conducted by Post and coworkers, Demodex was observed in 84% of the general population aged 60 years and 100% of the general population aged above 70 years [ 38 ].…”

Section: Discussionmentioning

confidence: 69%

Prevalence of Ocular Demodicosis and Ocular Surface Conditions in Patients Selected for Cataract Surgery

Nowomiejska

Łukasik

Brzozowska

et al. 2020

JCM

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The aim of the study was to analyze the prevalence of ocular demodicosis and ocular surface conditions in patients selected for cataract surgery. Eyelashes from 73 patients selected for cataract surgery were evaluated at × 40 and × 100 magnification using light microscopy. The anterior segment was assessed with the slit lamp. Additionally, Schirmer I and break up time (BUT) tests were carried out before surgery and 1 and 3 months postoperatively. A specially designed questionnaire containing e.g. information about chronic skin and eye diseases, previous ophthalmic surgeries, and patient's hygiene habits was used to assess the demographic variables. A majority of patients were at the age of 70–79 years, and there were more females (83%) in the study group. Demodex folliculorum was found in 48% of the patients. There was a correlation between the number of parasites and the presence of blepharitis, discharge at eyelid margins, and conjunctival hyperemia. Schirmer I and BUT test results were lower in patients with Demodex infestation before and after cataract surgery. The higher number of mites was correlated with lower Schirmer I test results postoperatively. The presence of Demodex mites influences the conjunctiva and lid margins leading to inflammation. The higher number of Demodex mites disturbs the tear film over time after cataract surgery.

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Section: Discussionmentioning

confidence: 69%

Prevalence of Ocular Demodicosis and Ocular Surface Conditions in Patients Selected for Cataract Surgery

Nowomiejska

Łukasik

Brzozowska

et al. 2020

JCM

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“…Demodex are cosmopolitan mites; so, their existence is recorded in many countries in all continents apart from Antarctica [ 15 , 16 ]. Currently, more than 100 different species of the Demodex genus are recognised.…”

Section: Introductionmentioning

confidence: 99%

Demodexsp. as a Potential Cause of the Abandonment of Soft Contact Lenses by Their Existing Users

Tarkowski¹,

Moneta-Wielgoś

Młocicki

2015

BioMed Research International

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Demodex mites may be a potential etiological factor in the development of various eye and skin disorders. The aim of the study was to investigate the presence of Demodex in the hair follicles of eyelashes and their potential influence on abandoning soft contact lenses which had been previously well tolerated by their users. A group of 62 users of contact lenses (28 with emerging discomfort and 34 without discomfort) were examined. There is a need to check the existence of a relationship between D. folliculorum or/and D. brevis infestation and the emergence of intolerance to the presence of soft contact lenses. The removed lashes were examined under light microscopy, applying standard parasitological methods if demodicosis is suspected. A positive result was assumed if at least one adult stage, larva, protonymph/nymph, or egg of D. folliculorum and/or D. brevis was present. A positive correlation was observed between the presence of Demodex and intolerance to contact lenses by their existing users (p < 0.05), and Demodex sp. infections were observed in 92.86% of patients with intolerance to contact lenses. Our results provide further evidence for the pathogenic role played by the mites in the development of eye diseases.

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“…Demodex er en type hårsekkmidd (follikkelmidd) som har stor utbredelse i befolkningen, tilsynelatende uavhengig av geografi, etnisitet og kjønn (Lacey, Kavanagh, & Tseng, 2009;Vargas-Arzola et al, 2012;Rather & Hassan, 2014;RusieckaZiółkowska, Nokiel, & Fleischer, 2014). Forekomsten ser ut til å vaere lav blant yngre individer, men øker kraftig med alderen og affiserer trolig majoriteten av alle individer over 50 år (Tabell 1).…”

Section: Introduksjonunclassified

“…Forekomsten ser ut til å vaere lav blant yngre individer, men øker kraftig med alderen og affiserer trolig majoriteten av alle individer over 50 år (Tabell 1). Note: Tabellen kombinerer resultater fra flere studier (Liu et al, 2010;Isa et al, 2011;Vargas-Arzola et al, 2012).…”

Section: Introduksjonunclassified

Dry eye and Demodex

Bruenech

Haugen

2014

Scand J Optom Vis Sci

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Dry eye syndrome (DES) is a common condition causing dry eye sensation and ocular inflammation. The etiology is not fully explored, but clinical trials have demonstrated that the secretory functions of the eyelids can be compromised by microorganisms.Demodex are parasites which can also infest the follicles and glands of the lids, but their adverse effect is not equally well documented. This paper presents some unique features of the parasites and their potential implication in the ethiology of DES and other ocular conditions, obtained through a case study and histological analysis of eyelids from previous research. Twentyfour eyelashes were methodically extracted from the eyelids of a 51 year old male identified with DES. The histological sections and eyelashes were analysed with light microscopy. Thirtyeight parasites were identified. They had a length of 300-555 µm and a diameter of 30-75 µm. The histological examinations indicated that the lash follicles accommodate considerably more secretory substance (in which most parasites are embedded) than what is revealed through conventional methods of lash extraction. It is therefore legitimate to assume that a population of Demodex is arguably larger than indicated by most clinical methods. Furthermore, the tubular system inside the meibomian glands was found to have diameters that corresponded with the diameters of the parasites, which indicates that the parasites are physically capable of blocking the secretory passageways. Finally, the parasites have eight segmented, claw-shaped legs with large ranges of motion. The mechanical and immunological provocation they inflict on host tissues is arguably sufficient to cause inflammation. This paper promotes the view that when a population of Demodex reaches a critical level it has the capacity to cause secretory dysfunctions in the eyelids and may hence be implicated in the etiology of DES and other ocular inflammatory conditions. Sammendrag «Dry eye syndrome» (DES) er en hyppig forekommende tilstand som gir tørrhetsfølelse og okulaer inflammasjon. Etiologien er ikke fullstendig kartlagt, men kliniske studier har vist at mikroorganismer kan bidra til å skape dysfunksjoner i øyelokkets sekretoriske system. Demodex er parasitter som også kan infisere hårfollikler og kjertler i øyelokket, men den helsemessige betydningen av disse organismene er mindre dokumentert. Kasuset presenterer unike saertrekk ved parasitten og dens potensielle evne til å vaere involvert i etiologien til DES og andre okulaere lidelser via en kasuistikk og histologiske analyser av øyelokk fra tidligere studier. Tjuefire cilier ble metodisk epilert fra øyelokket på en 51 år gammel mann identifisert med DES. De histologiske snittene og ciliene ble analysert med lysmikroskop. Totalt 38 parasitter ble identifisert. De hadde en lengde på 300-555 µm og diameter på 30-75 µm. De histologiske analysene indikerte at folliklene i øyelokket inneholder vesentlig mer sekret (hvor flest parasitter oppholder seg) enn det som fremkommer ved bruk av tradisjone...

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Prevalence of Demodex mites in eyelashes among people of Oaxaca, Mexico

Cited by 28 publications

References 19 publications

Prevalence of Ocular Demodicosis and Ocular Surface Conditions in Patients Selected for Cataract Surgery

Prevalence of Ocular Demodicosis and Ocular Surface Conditions in Patients Selected for Cataract Surgery

Demodexsp. as a Potential Cause of the Abandonment of Soft Contact Lenses by Their Existing Users

Dry eye and Demodex

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