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dc.contributor.authorBuckhurst, P
dc.contributor.authorNaroo, SA
dc.contributor.authorDavies, LN
dc.contributor.authorShah, S
dc.contributor.authorBuckhurst, Hetal
dc.contributor.authorKingsnorth, A
dc.contributor.authorDrew, T
dc.contributor.authorWolffsohn, JS
dc.date.accessioned2017-05-04T12:04:28Z
dc.date.available2017-05-04T12:04:28Z
dc.date.issued2015-11
dc.identifier.issn0886-3350
dc.identifier.issn1873-4502
dc.identifier.urihttp://hdl.handle.net/10026.1/9185
dc.description.abstract

PURPOSE: To assess the validity and repeatability of the Aston Halometer. SETTING: University clinic, United Kingdom. DESIGN: Prospective, repeated-measures experimental study. METHODS: The halometer comprises a bright light-emitting-diode (LED) glare source in the center of an iPad4. Letters subtending 0.21° (~0.3 logMAR) were moved centrifugally from the LED in 0.05 degree steps in 8 orientations separated by 45 degrees for each of 4 contrast levels (1000, 500, 100, and 25 Weber contrast units [Cw]) in random order. Bangerter occlusion foils were inserted in front of the right eye to simulate monocular glare conditions in 20 subjects (mean age 27.7 ± 3.1 years). Subjects were positioned 2 meters from the screen in a dark room with the iPad controlled from an iPhone via Bluetooth operated by the researcher. The C-Quant straylight meter was also used with each of the foils to measure the level of straylight over the retina. Halometry and straylight repeatability was assessed at a second visit. RESULTS: Halo size increased with the different occlusion foils and target contrasts (F = 29.564, P < .001) as expected and in a pattern similar to straylight measures (F = 80.655, P < 0.001). Lower contrast letters showed better sensitivity but larger glare-obscured areas, resulting in ceiling effects caused by the screen's field-of-view, with 500 Cw being the best compromise. Intraobserver and interobserver repeatability of the Aston Halometer was good (500Cw: 0.84 to 0.93 and 0.53 to 0.73) and similar to the straylight meter. CONCLUSION: The halometer provides a sensitive, repeatable way of quantifying a patient-recognized form of disability glare in multiple orientations to add objectivity to subjectively reported discomfort glare.

dc.format.extent2424-2429
dc.format.mediumPrint
dc.languageen
dc.language.isoeng
dc.publisherOvid Technologies (Wolters Kluwer Health)
dc.subjectAdult
dc.subjectComputers, Handheld
dc.subjectDiagnostic Techniques, Ophthalmological
dc.subjectDisability Evaluation
dc.subjectFemale
dc.subjectGlare
dc.subjectHumans
dc.subjectMale
dc.subjectObserver Variation
dc.subjectProspective Studies
dc.subjectReproducibility of Results
dc.subjectScattering, Radiation
dc.subjectSensitivity and Specificity
dc.subjectVision Disorders
dc.titleTablet App halometer for the assessment of dysphotopsia
dc.typejournal-article
dc.typeJournal Article
dc.typeValidation Study
plymouth.author-urlhttps://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000368051300013&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=11bb513d99f797142bcfeffcc58ea008
plymouth.issue11
plymouth.volume41
plymouth.publication-statusPublished
plymouth.journalJournal of Cataract and Refractive Surgery
dc.identifier.doi10.1016/j.jcrs.2015.05.041
plymouth.organisational-group/Plymouth
plymouth.organisational-group/Plymouth/Admin Group - REF
plymouth.organisational-group/Plymouth/Admin Group - REF/REF Admin Group - FoH
plymouth.organisational-group/Plymouth/Faculty of Health
plymouth.organisational-group/Plymouth/Faculty of Health/School of Health Professions
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA/UoA03 Allied Health Professions, Dentistry, Nursing and Pharmacy
plymouth.organisational-group/Plymouth/Research Groups
plymouth.organisational-group/Plymouth/Research Groups/Institute of Health and Community
plymouth.organisational-group/Plymouth/Users by role
plymouth.organisational-group/Plymouth/Users by role/Academics
dc.publisher.placeUnited States
dcterms.dateAccepted2015-05-01
dc.identifier.eissn1873-4502
dc.rights.embargoperiodNo embargo
rioxxterms.versionofrecord10.1016/j.jcrs.2015.05.041
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2015-11
rioxxterms.typeJournal Article/Review


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