| Accommodation in emmetropic and myopic young adults wearing bifocal soft contact lenses. | |
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MedLine Citation:
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PMID: 18201337 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To assess the effect of bifocal soft contact lenses on the accommodative errors (lags) of young adults. Recent studies suggest that bifocal soft contact lenses are an effective myopia control treatment although the underlying mechanism is not understood. METHODS: Accommodation responses were measured for four target distances: 100, 50, 33 and 25 cm in 35 young adult subjects (10 emmetropes and 25 myopes; mean age, 22.8 +/- 2.5 years). Measurements were made under both monocular and binocular conditions with three types of lenses: single vision distance soft contact lenses (SVD), single vision near soft contact lenses (SVN; +1.50 D added to the distance prescription) and bifocal soft contact lenses (BF; +1.50 D add). RESULTS: For the SVD lenses, all subjects exhibited lags of accommodation, with myopes accommodating significantly less than emmetropes for the 100 and 50 cm target distances (p < 0.05). With the SVN lenses, there was no significant difference in accommodative responses between emmetropes and myopes. With the BF lenses, both emmetropic and myopic groups exhibited leads in accommodation for all target distances, with emmetropes showing significantly greater leads for all distances (p < 0.005). CONCLUSIONS: Overall, myopes tended to accommodate less than emmetropes, irrespective of the contact lens type, which significantly affected accommodation for both groups. The apparent over-accommodation of myopes when wearing the BF contact lenses may explain the reported efficacy as a myopia control treatment, although further studies are required to elucidate the mechanism underlying this accommodative effect. |
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Authors:
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Janice Tarrant; Holly Severson; Christine F Wildsoet |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) Volume: 28 ISSN: 0275-5408 ISO Abbreviation: Ophthalmic Physiol Opt Publication Date: 2008 Jan |
Date Detail:
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Created Date: 2008-01-18 Completed Date: 2008-06-05 Revised Date: 2010-12-17 |
Medline Journal Info:
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Nlm Unique ID: 8208839 Medline TA: Ophthalmic Physiol Opt Country: England |
Other Details:
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Languages: eng Pagination: 62-72 Citation Subset: IM |
Affiliation:
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School of Optometry, 592 Minor Hall, University of California, Berkeley, CA 94720-2020, USA. jmtarrant@berkeley.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Accommodation, Ocular
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physiology* Adult Contact Lenses, Hydrophilic* Humans Myopia / physiopathology* Refraction, Ocular / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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R01 EY012392-07/EY/NEI NIH HHS; R01 EY12392-06/EY/NEI NIH HHS; T32 EY07043/EY/NEI NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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