Lipid layer thickness decrease due to meibomian gland dysfunction leads to tear film instability and reflex tear secretion
TL;DR: The measurement of the tear film parameters including lipid layer thickness suggests that the obstructive MGD is more prevalent than hypersecretary MGD and the aqueous layer compensates the decreased lipid layer caused by MGD.
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Abstract: Abstract Purpose To determine the clinical effects of ocular surface and Meibomian gland parameters on tear film stability among individuals with Meibomian gland dysfunction (MGD), those with aqueous deficient dry eye (ADDE), individuals with both conditions and normal controls. Methods Patients were divided into four groups: normal controls, patients with ADDE, patients with MGD, and patients who fulfilled diagnostic criteria for ADDE and MGD (Mixed Group). Data for ocular symptom score, lid margin abnormality, ocular staining, tear break-up time, meiboscore, and lipid layer thickness (LLT) measured by a Lipiview interferometer, Schirmer test, and MGD severity score were collected. Results A total of 109 patients (109 eyes) were evaluated. In patients with MGD, LLT was significantly lower than the ADDE patients. However, the Schirmer test value was the highest in the MGD group. The LLT negatively correlated with meiboscore and MGD severity score in the MGD group. Significant correlation between Schirmer test value and meiboscore was definite in the MGD group. Conclusions Tear fluid secretion is more increased and lipid layer thickness is more decreased in MGD patients than in ADDE patients. Decreased lipid layer thickness caused by MGD-related tear film instability may stimulate reflex tear secretion. The obstructive MGD is more prevalent than hypersecretary MGD. Key messages The tear film stability is affected by Mebomian gland dysfunction (MGD). The measurement of the tear film parameters including lipid layer thickness suggests that the obstructive MGD is more prevalent than hypersecretary MGD and the aqueous layer compensates the decreased lipid layer caused by MGD.
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TL;DR: In this paper , clinical evidence regarding available treatments and emerging therapies from randomized studies in patients with dry eye disease associated with MGD is summarized, and the primary treatment goal for DED associated with meibomian gland dysfunction is to restore the tear film lipid layer and decrease evaporation, thereby reducing ocular signs and symptoms.
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TL;DR: It is accepted that MGD is important, conceivably underestimated, and possibly the most frequent cause of dry eye disease due to increased evaporation of the aqueous tears, and a comprehensive review of physiological and pathophysiological aspects of the meibomian glands is sought.
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TL;DR: This paper presents a poster presented at the first International Workshop on Meibomian Gland Dysfunction at the annual meeting of the Tear Film and Ocular Surface Society in Toronto, Canada.
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J. Daniel Nelson,Jun Shimazaki,Jose M. Benitez-del-Castillo,Jennifer P. Craig,James P. McCulley,Seika Den,Gary N. Foulks +6 more
TL;DR: Anatomic changes of the lid margin, expressibility of meibomian lipids, gland dropout by meibography, evaporimetry, and meibometry are most commonly used.
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The International Workshop on Meibomian Gland Dysfunction: Report of the Diagnosis Subcommittee
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