Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/35051
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dc.contributorSchool of Optometryen_US
dc.contributorDepartment of Biomedical Engineeringen_US
dc.creatorChu, CHGen_US
dc.creatorZhou, Yen_US
dc.creatorZheng, Yen_US
dc.creatorKee, CSen_US
dc.date.accessioned2016-02-29T02:57:00Z-
dc.date.available2016-02-29T02:57:00Z-
dc.identifier.issn0042-6989en_US
dc.identifier.urihttp://hdl.handle.net/10397/35051-
dc.language.isoenen_US
dc.publisherPergamon Pressen_US
dc.rights© 2014 Elsevier Ltd. All rights reserveden_US
dc.rights© 2014. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.subjectCorneal accommodationen_US
dc.subjectCornea curvatureen_US
dc.subjectCorneal videokeratography systemen_US
dc.subjectAstigmatismen_US
dc.subjectChickensen_US
dc.titleBi-directional corneal accommodation in alert chicks with experimentally-induced astigmatismen_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.spage26en_US
dc.identifier.epage34en_US
dc.identifier.volume98en_US
dc.identifier.doi10.1016/j.visres.2014.03.002en_US
dcterms.abstractThis study aimed to characterize corneal accommodation in alert chicks with and without experimentally-induced astigmatism. Refraction and corneal biometry were measured in 16 chicks with experimentally-induced astigmatism (>1.00 D) and 6 age-matched control chicks (astigmatism ⩽1.00 D). Corneal accommodation was detected using a Placido-ring based videokeratography system, by measuring changes in corneal curvature from a series of consecutive images acquired from alert chicks. The correlation between the magnitudes of corneal accommodation and astigmatism was analyzed by including data from all 22 chicks. Data from all eyes showed obvious bi-directional changes in corneal accommodation. There was no significant difference in corneal accommodative changes between the fellow eyes of the treated birds, and the right and left eyes of control birds. However, positive accommodation (PA) and maximum magnitude of PA (MPA) were significantly higher in the astigmatic vs. the fellow eyes of treated chicks (mean ± SE: PA = +2.24 ± 0.44 D vs. +1.26 ± 0.20 D; MPA = +7.53 ± 0.81 D vs. +4.38 ± 0.53 D, both p < 0.05). This was not the case for negative accommodation (NA) or maximum magnitude of NA (MNA) (NA = −0.46 ± 0.15 D vs. −0.33 ± 0.04 D; MNA = −0.92 ± 0.23 D vs. −0.73 ± 0.12 D, respectively, p > 0.05). Furthermore, higher PA and MPA were found to be correlated with higher refractive astigmatism (both r = 0.34, p < 0.05). These results suggest that the presence of astigmatism may interfere with accommodative function in chicks.en_US
dcterms.accessRightsopen accessen_US
dcterms.bibliographicCitationVision research, May 2014, v. 98, p. 26-34en_US
dcterms.isPartOfVision researchen_US
dcterms.issued2014-05-
dc.identifier.pmid24637152-
dc.identifier.rosgroupidr70514-
dc.description.ros2013-2014 > Academic research: refereed > Publication in refereed journalen_US
dc.description.oaAccepted Manuscripten_US
dc.identifier.FolderNumbera0752-n03-
dc.description.fundingSourceRGCen_US
dc.description.fundingSourceOthersen_US
dc.description.fundingTextRGC: General Research Fund #561209; Others: The Centre of Myopia Research and The Niches Areas-Myopia Research Fund (J-BB7P) from The Hong Kong Polytechnic University.en_US
dc.description.pubStatusPublisheden_US
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