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An N, Dou X, Yin N, Lu H, Zheng J, Liu X, Yang H, Zhu X, Xiao X. The Use of Digital PCR for the Diagnosis of Demodex Blepharitis. Curr Eye Res 2024; 49:33-38. [PMID: 37823373 DOI: 10.1080/02713683.2023.2265083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 09/26/2023] [Indexed: 10/13/2023]
Abstract
PURPOSE This was a pilot study to evaluate the efficacy of digital polymerase chain reaction detection of Demodex in eyelid margin swabs for the diagnosis of Demodex blepharitis. This study aims to explore the possibility of digital polymerase chain reaction detection to improve the diagnostic accuracy of Demodex blepharitis detection. METHODS Volunteers were prospectively recruited and classified by experienced doctors into suspected Demodex blepharitis or healthy controls using slit-lamp evaluation of the eyelid margin and an inquiry about symptoms. Three eyelashes from each eyelid were epilated from participants in each group for microscopic observation and mite counting. Then, swabs from the eyelid margins of each eye were collected after the eyelashes were epilated and stored at -80 °C for future DNA extraction and digital polymerase chain reaction detection. The positive or negative results of both methods were compared for diagnostic accuracy, and the Kappa value was also calculated to evaluate their consistency. RESULTS The accuracy of the digital polymerase chain reaction detection was 71.6% and that of the mite counting method was 75%. Their combined accuracy was improved to 77.3%. The Kappa value of the two methods was 0.505, indicating moderate consistency. CONCLUSION Digital polymerase chain reaction detection of Demodex from ocular surface swabs was painless and noninvasive and is a potentially accurate quantitative method available for diagnosing Demodex blepharitis. This method is also complementary to the conventional mite counting method, particularly when a sufficient number of eyelashes cannot be effectively epilated.
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Affiliation(s)
- Na An
- Shaanxi Provincial Clinical Research Center for Ophthalmic Diseases, Xi'an City First Hospital, Xi'an, China
- Shaanxi Key Laboratory of Ophthalmology, Shaanxi Institute of Ophthalmology, Xi'an, China
| | - Xiuhong Dou
- Shaanxi Key Laboratory of Ophthalmology, Shaanxi Institute of Ophthalmology, Xi'an, China
| | - Ni Yin
- Shaanxi Provincial Clinical Research Center for Ophthalmic Diseases, Xi'an City First Hospital, Xi'an, China
- Shaanxi Key Laboratory of Ophthalmology, Shaanxi Institute of Ophthalmology, Xi'an, China
| | - Haiqing Lu
- Shaanxi Provincial Clinical Research Center for Ophthalmic Diseases, Xi'an City First Hospital, Xi'an, China
- Shaanxi Key Laboratory of Ophthalmology, Shaanxi Institute of Ophthalmology, Xi'an, China
| | - Jie Zheng
- Clinical Research Center, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Xianning Liu
- Shaanxi Provincial Clinical Research Center for Ophthalmic Diseases, Xi'an City First Hospital, Xi'an, China
- Shaanxi Key Laboratory of Ophthalmology, Shaanxi Institute of Ophthalmology, Xi'an, China
| | - Hua Yang
- Shaanxi Provincial Clinical Research Center for Ophthalmic Diseases, Xi'an City First Hospital, Xi'an, China
- Shaanxi Key Laboratory of Ophthalmology, Shaanxi Institute of Ophthalmology, Xi'an, China
| | - Xiuping Zhu
- Shaanxi Provincial Clinical Research Center for Ophthalmic Diseases, Xi'an City First Hospital, Xi'an, China
- Shaanxi Key Laboratory of Ophthalmology, Shaanxi Institute of Ophthalmology, Xi'an, China
| | - Xianghua Xiao
- Shaanxi Provincial Clinical Research Center for Ophthalmic Diseases, Xi'an City First Hospital, Xi'an, China
- Shaanxi Key Laboratory of Ophthalmology, Shaanxi Institute of Ophthalmology, Xi'an, China
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Huang WL, Huang CM, Chu CY, Hu FR. Comorbidity of Ocular and Facial Demodicosis. Am J Ophthalmol 2024; 257:201-211. [PMID: 37739203 DOI: 10.1016/j.ajo.2023.09.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 09/11/2023] [Accepted: 09/11/2023] [Indexed: 09/24/2023]
Abstract
PURPOSE To determine the association between ocular and facial demodicosis, and the effect of facial treatment on ocular demodicosis. DESIGN Prospective clinical cohort study. METHODS Ocular demodicosis outpatients from a tertiary medical center were enrolled from April to December 2020. The diagnosis was based on epilation of 4 eyelashes from each upper eyelid. High ocular Demodex load (ODL) was defined as ≥8 mites per eye. Facial infestation was assessed by direct microscopic examination, with facial Demodex overgrowth (FDO) defined as a density >5 mites/cm2. All patients were prescribed 3 months of ocular treatment, and FDO patients received dermatologic treatment. RESULTS Eighty-nine patients were enrolled. Among those that completed the treatment course, 39 presented high ODL. Lower cylindrical sleeve counts were found in low ODL patients (low ODL vs high ODL: 8 vs 14, P = .009). FDO was less prevalent in this group (49% vs 77%, P = .012). The Ocular Surface Disease Index score decreased in patients without FDO (20.0 ± 17.1 to 14.0 ± 16.6, P = .027) after 3 months of topical tea tree oil treatment. Topical ivermectin treatment on the facial skin provided a higher ocular Demodex eradication rate in FDO patients (76% vs 16%, P < .001). CONCLUSION Concurrence of ocular and facial demodicosis is common, especially in cases of severe ocular demodicosis. Although ocular treatment alone is effective for patients with ocular demodicosis only, cotreatment with topical ivermectin on the facial skin enhances ocular Demodex eradication in patients with comorbid facial Demodex overgrowth.
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Affiliation(s)
- Wei-Lun Huang
- From the Department of Ophthalmology, National Taiwan University Hospital Hsinchu Branch (W.-L.H.), Hsinchu, Taiwan; Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University (W.-L.H.), Taipei, Taiwan
| | - Chang-Ming Huang
- Department of Dermatology, National Taiwan University Hospital, College of Medicine, National Taiwan University (C.-M.H., C.-Y.C.), Taipei, Taiwan
| | - Chia-Yu Chu
- Department of Dermatology, National Taiwan University Hospital, College of Medicine, National Taiwan University (C.-M.H., C.-Y.C.), Taipei, Taiwan
| | - Fung-Rong Hu
- Department of Ophthalmology, National Taiwan University Hospital, College of Medicine, National Taiwan University (F.-R.H.), Taipei, Taiwan.
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Gao H, Chen H, Xie HT, Xu KK, Shi BJ, Huang YK. Changes in Meibum Lipid Composition With Ocular Demodex Infestation. Transl Vis Sci Technol 2021; 10:6. [PMID: 34874449 PMCID: PMC8662575 DOI: 10.1167/tvst.10.14.6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Purpose The purpose of this study was to understand the impact of Demodex infection in the lipid component of meibum in patients. Methods The meibum samples were collected from four groups of subjects: (1) Demodex-negative with non-MGD (D−M−; n = 10); (2) Demodex-positive with non-MGD (D+M−; n = 10); (3) Demodex-negative with MGD (D−M+; n = 10); and (4) Demodex-positive with MGD (D+M+; n = 10). A liquid chromatography–mass spectrometry (LC-MS) system consisting of ultra-performance liquid chromatography and a Q Exactive high-resolution mass spectrometer was used for lipids separation and detection. Results Compared with the D−M− group, the D+M− group had lower levels of phosphatidylcholines (PCs) and lysophosphatidylcholines (LPCs) and higher levels of phosphatidylethanolamines (PEs). Compared with the D−M+ group, the levels of sphingomyelins (SMs) and PCs in the D+M+ group were decreased, whereas the levels of (O-acyl)-ω-hydroxy fatty acids (OAHFAs), ceramides (CERs), LPCs, and diacylglycerols (DGs) were significantly increased. Triacylglycerols (TGs), DGs, CERs, and OAHFAs were decreased in D−M+ group, whereas levels of PEs, phosphatidylinositols, and phosphatidylglycerols were increased in meibum obtained from the D−M+ group compared with those in the D−M− group. TGs, SMs, CERs, and PEs were decreased in the D+M+ group, whereas levels of LPCs, LPEs, PCs, and PEs were increased in meibum from the D−M+ group compared with those in the D+M− group. Conclusions To the best of our knowledge, this is the first study to assess the changes in meibum from patients with ocular Demodex infestation. The significant increase of OAHFAs in the Demodex-positive group suggest that OAHFAs may be associated with the progress of ocular Demodex infections. Translational Relevance OAHFAs could be a potential new therapeutic target for ocular Demodex infestation.
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Affiliation(s)
- Hui Gao
- Department of Ophthalmology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Aier Eye Hospital of Wuhan University, Wuhan, China
| | - Hua Chen
- Department of Ophthalmology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hua-Tao Xie
- Department of Ophthalmology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Kang-Kang Xu
- Department of Ophthalmology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Bing-Jie Shi
- Department of Ophthalmology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yu-Kan Huang
- Department of Ophthalmology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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Arici C, Mergen B, Bahar Tokman H, Yildiz Tas A, Tokuc E, Ozturk Bakar Y, Sahin A. Investigation of the Demodex Lid Infestation with in Vivo Confocal Microscopy versus Light Microscopy in Patients with Seborrheic Blepharitis. Ocul Immunol Inflamm 2021; 30:973-977. [PMID: 33560183 DOI: 10.1080/09273948.2020.1857792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Aim: The comparison of the diagnostic efficiency of a reference method (light microscopy [LM] using 10% potassium hydroxide [KOH]) with the use of 100% alcohol to in vivo confocal microscopy (IVCM) for the detection of Demodex eyelid infestation in seborrheic blepharitis patients.Methods: Eyelashes were epilated from the right eyes for the reference method and the left eyes for the alcohol group in 58 eyes of 29 patients. IVCM was used on the left eyes. The primary outcomes were the number of Demodex mites per lash and the rate of Demodex positivity (≥1 mite).Results: The rate of Demodex positivity was similar among the three groups (KOH: 82.8%, alcohol: 86.2%, IVCM: 72.4%; p >.05). The mean number of mites per lash in the KOH group (1.5 ± 1.3) was higher than in the alcohol (0.9 ± 0.6, p =.041) and IVCM groups (0.9 ± 0.9, p =.036).Conclusion: KOH was found to be superior in terms of the quantification of mites compared to alcohol and IVCM.
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Affiliation(s)
- Ceyhun Arici
- Cerrahpasa Medical Faculty, Department of Ophthalmology, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Burak Mergen
- Department of Ophtahlmology, University of Health Sciences, Basaksehir Cam Ve Sakura City Hospital, Istanbul, Turkey
| | - Hrisi Bahar Tokman
- Cerrahpasa Medical Faculty, Department of Medical Microbiology, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Ayse Yildiz Tas
- Department of Ophthalmology, Koc University Medical Faculty, Istanbul, Turkey
| | - Edip Tokuc
- Cerrahpasa Medical Faculty, Department of Medical Microbiology, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Yesim Ozturk Bakar
- Cerrahpasa Medical Faculty, Department of Medical Microbiology, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Afsun Sahin
- Department of Ophthalmology, Koc University Medical Faculty, Istanbul, Turkey
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Abstract
A biomarker is a "characteristic that is measured as an indicator of normal biological processes, pathogenic processes, or responses to an exposure or intervention, including therapeutic interventions." Recently, calls for biomarkers for ocular surface diseases have increased, and advancements in imaging technologies have aided in allowing imaging biomarkers to serve as a potential solution for this need. This review focuses on the state of imaging biomarkers for ocular surface diseases, specifically non-invasive tear break-up time (NIBUT), tear meniscus measurement and corneal epithelial thickness with anterior segment optical coherence tomography (OCT), meibomian gland morphology with infrared meibography and in vivo confocal microscopy (IVCM), ocular redness with grading scales, and cellular corneal immune cells and nerve assessment by IVCM. Extensive literature review was performed for analytical and clinical validation that currently exists for potential imaging biomarkers. Our summary suggests that the reported analytical and clinical validation state for potential imaging biomarkers is broad, with some having good to excellent intra- and intergrader agreement to date. Examples of these include NIBUT for dry eye disease, ocular redness grading scales, and detection of corneal immune cells by IVCM for grading and monitoring inflammation. Further examples are nerve assessment by IVCM for monitoring severity of diabetes mellitus and neurotrophic keratitis, and corneal epithelial thickness assessment with anterior segment OCT for the diagnosis of early keratoconus. However, additional analytical validation for these biomarkers is required before clinical application as a biomarker.
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Ben Hadj Salah W, Baudouin C, Doan S, Angoulvant A, Gottlieb J, Bénichou J, Da Cunha E, Eid L, Labetoulle M, Rousseau A. [Demodex and ocular surface disease]. J Fr Ophtalmol 2020; 43:1069-1077. [PMID: 33127178 DOI: 10.1016/j.jfo.2020.08.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 08/08/2020] [Accepted: 08/24/2020] [Indexed: 12/12/2022]
Abstract
Demodex is a saprophytic mite of the ocular adnexa, which can in certain circumstances proliferate on the skin of the face and on the eyelid margins. It is involved in facial rosacea (especially in the papulopustular form) and in the development or aggravation of anterior and/or posterior blepharitis or even keratoconjunctivitis, often in association with cutaneous lesions ; the pathophysiology is often multifactorial. Symptoms are non-specific, but the presence of cylindrical sleeves on the eyelashes is very suggestive of infestation, and certain techniques of biomicroscopic examination or imaging, such as confocal microscopy in vivo, allow direct visualization of the parasite. Parasitological examination of the eyelashes can confirm the diagnosis and can be improved by good sampling technique. Eyelid hygiene and oil-based ointments are the cornerstone of treatment. New specific treatments, in particular topical treatments based on tea tree oil, ivermectin, as well as pulsed light therapy and micro-exfoliation of the eyelid margin, can help to reduce the parasitic load and improve symptoms.
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Affiliation(s)
- W Ben Hadj Salah
- Service d'ophtalmologie, hôpital Bicêtre, CHU de Bicêtre, Assistance Publique-Hôpitaux de Paris, université Paris-Saclay, réseau OPHTARA : maladies rares en ophtalmologie, Paris, France
| | - C Baudouin
- Services d'ophtalmologie, CHNO des XV-XX, et hôpital Ambroise-Paré, Assistance Publique-Hôpitaux de Paris, université Versailles-St-Quentin-en-Yvelines, IHU de Sight Restore Saclay, Paris, France; Institut de la vision, Sorbonne université, Inserm, CNRS, Sorbonne, France
| | - S Doan
- Service d'ophtalmologie, CHU de Bichat, Assistance Publique-Hôpitaux de Paris et Fondation ophtalmologique Rothschild, réseau OPHTARA : maladies rares en ophtalmologie, Paris, France
| | - A Angoulvant
- Service de parasitologie, hôpital Bicêtre, CHU de Bicêtre, Assistance Publique-Hôpitaux de Paris, université Paris-Saclay, Paris, France
| | - J Gottlieb
- Service d'immunologie clinique & consultation de dermatologie, hôpital Bicêtre, CHU de Bicêtre, Assistance Publique-Hôpitaux de Paris, université Paris-Saclay, Paris, France
| | - J Bénichou
- Service d'ophtalmologie, hôpital Bicêtre, CHU de Bicêtre, Assistance Publique-Hôpitaux de Paris, université Paris-Saclay, réseau OPHTARA : maladies rares en ophtalmologie, Paris, France
| | - E Da Cunha
- Service d'ophtalmologie, hôpital Bicêtre, CHU de Bicêtre, Assistance Publique-Hôpitaux de Paris, université Paris-Saclay, réseau OPHTARA : maladies rares en ophtalmologie, Paris, France
| | - L Eid
- Service d'ophtalmologie, hôpital Bicêtre, CHU de Bicêtre, Assistance Publique-Hôpitaux de Paris, université Paris-Saclay, réseau OPHTARA : maladies rares en ophtalmologie, Paris, France
| | - M Labetoulle
- Service d'ophtalmologie, hôpital Bicêtre, CHU de Bicêtre, Assistance Publique-Hôpitaux de Paris, université Paris-Saclay, réseau OPHTARA : maladies rares en ophtalmologie, Paris, France; Département immunologie des maladies virales, auto-immunes, bactériennes et hématologiques (IMVA-HB). UMR 1184, CEA, Fontenay-Aux-Roses, France
| | - A Rousseau
- Service d'ophtalmologie, hôpital Bicêtre, CHU de Bicêtre, Assistance Publique-Hôpitaux de Paris, université Paris-Saclay, réseau OPHTARA : maladies rares en ophtalmologie, Paris, France; Département immunologie des maladies virales, auto-immunes, bactériennes et hématologiques (IMVA-HB). UMR 1184, CEA, Fontenay-Aux-Roses, France.
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Comparison of Biomicroscopy and Light Microscopy Findings in Demodex Diagnosis in Patients With Chronic Blepharitis. Eye Contact Lens 2020; 46:297-300. [DOI: 10.1097/icl.0000000000000660] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Zhang AC, Muntz A, Wang MTM, Craig JP, Downie LE. Ocular Demodex: a systematic review of the clinical literature. Ophthalmic Physiol Opt 2020; 40:389-432. [PMID: 32691894 DOI: 10.1111/opo.12691] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Revised: 04/06/2020] [Accepted: 04/14/2020] [Indexed: 12/11/2022]
Abstract
PURPOSE There is increasing clinical and research interest in the potential contribution of Demodex to ocular surface disease. The aim of this systematic review was to summarise and synthesise current clinical evidence relating to the aetiology, diagnosis and treatment of ocular Demodex. RECENT FINDINGS A comprehensive literature search was performed in OVID Medline, OVID Embase, and clinical trial registries, for studies published between 1990 and August 2019, examining Demodex on the ocular surface. The review included primary clinical research studies and systematic reviews of primary clinical research studies, where Demodex was considered in the context of the ocular surface and/or adnexa. Studies were categorised using the National Health and Medical Research Council evidence hierarchy. Risk of bias assessment was performed using validated tools for studies categorised as providing Level I or II evidence. A total of 87 studies were eligible for inclusion, including two systematic reviews. Most studies (60%) were observational, describing the prevalence of ocular Demodex in different clinical populations. There was a high degree of variability in the epidemiological data derived from cross-sectional aetiology studies. There was mostly consistent evidence to support an association between ocular Demodex and chronic blepharitis. Seven diagnostic test-accuracy studies were identified, which considered a range of techniques, including slit lamp examination for cylindrical eyelash collarettes and/or eyelash manipulation techniques, light microscopic evaluation of epilated eyelashes and in vivo confocal microscopy. There is currently no accepted gold-standard diagnostic method for ocular Demodex. For intervention studies, there was one systematic review, 11 published randomised trials, six trial registry entries, and nine case series. Despite a number of recent trials, the appropriate treatment regimen for ocular Demodex (including the optimal criteria and timing of an intervention) is not clearly established. CONCLUSIONS This comprehensive narrative synthesis has captured the landscape of clinical evidence relating to the prevalence, aetiology, diagnosis and treatment of ocular Demodex. There remain opportunities to enhance understanding of its role in ocular surface disease, best diagnostic approaches and optimal treatment protocols.
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Affiliation(s)
- Alexis Ceecee Zhang
- Department of Optometry and Vision Sciences, The University of Melbourne, Melbourne, Australia
| | - Alex Muntz
- Department of Ophthalmology, New Zealand National Eye Centre, The University of Auckland, Auckland, New Zealand
| | - Michael T M Wang
- Department of Ophthalmology, New Zealand National Eye Centre, The University of Auckland, Auckland, New Zealand
| | - Jennifer P Craig
- Department of Ophthalmology, New Zealand National Eye Centre, The University of Auckland, Auckland, New Zealand
| | - Laura E Downie
- Department of Optometry and Vision Sciences, The University of Melbourne, Melbourne, Australia
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