| Influence of the blink interval on tear meniscus height in soft contact lens and nonlens wearers. | |
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MedLine Citation:
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PMID: 20395868 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: Tear meniscus height (TMH) is an indirect measurement of tear film volume. This study investigated the temporal changes in the TMH during the blink interval in the morning (8-9 am) and at the end of the day (5-6 pm) in both soft contact lens (CL) and nonlens wearers (NLW). METHODS: Fifty participants (25 CL; 25 NLW) were evaluated for their subjective symptoms, TMH, noninvasive break up time, and bulbar hyperemia at the am and pm visits on the same day. The TMH was measured at set intervals between 2 and 15 sec during the blink interval, using an optical coherence tomographer. RESULTS: The NLW group revealed no changes in a variety of symptoms during the day, whereas the CL group reported an increase in dryness (P=0.03) and grittiness (P=0.02) over the day. For both groups, the TMH and calculated tear meniscus volume revealed lower values immediately after the blink and increased progressively afterwards, mainly due to reflex tearing. The am tear meniscus volume values tended to be higher than the pm values for both groups, but this was not significant (NLW P=0.13; CL P=0.82). Noninvasive break up time deteriorated during the day for both groups but was only significant for the CL group (P=0.002), whereas bulbar hyperemia revealed no statistically significant change for either group. CONCLUSIONS: Reflex tearing may play a substantial role in the TMH differences observed over the blink interval. Standardization of the time when a TMH measurement is performed will be valuable in comparing tear film clinical studies. |
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Authors:
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Etty Bitton; Lyndon Jones; Trefford Simpson; Craig Woods |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Eye & contact lens Volume: 36 ISSN: 1542-233X ISO Abbreviation: Eye Contact Lens Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-05-10 Completed Date: 2010-08-12 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101160941 Medline TA: Eye Contact Lens Country: United States |
Other Details:
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Languages: eng Pagination: 156-63 Citation Subset: IM |
Affiliation:
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Ecole d'optometrie, Universite de Montreal, Quebec, Canada. etty.bitton@umontreal.ca |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Blinking* Contact Lenses, Hydrophilic / adverse effects* Eye / blood supply Female Humans Hyperemia / etiology, physiopathology Male Middle Aged Tears / metabolism* Time Factors Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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