Tablet App halometer for the assessment of dysphotopsia
dc.contributor.author | Buckhurst, P | |
dc.contributor.author | Naroo, SA | |
dc.contributor.author | Davies, LN | |
dc.contributor.author | Shah, S | |
dc.contributor.author | Buckhurst, Hetal | |
dc.contributor.author | Kingsnorth, A | |
dc.contributor.author | Drew, T | |
dc.contributor.author | Wolffsohn, JS | |
dc.date.accessioned | 2017-05-04T12:04:28Z | |
dc.date.available | 2017-05-04T12:04:28Z | |
dc.date.issued | 2015-11 | |
dc.identifier.issn | 0886-3350 | |
dc.identifier.issn | 1873-4502 | |
dc.identifier.uri | http://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.extent | 2424-2429 | |
dc.format.medium | ||
dc.language | en | |
dc.language.iso | eng | |
dc.publisher | Ovid Technologies (Wolters Kluwer Health) | |
dc.subject | Adult | |
dc.subject | Computers, Handheld | |
dc.subject | Diagnostic Techniques, Ophthalmological | |
dc.subject | Disability Evaluation | |
dc.subject | Female | |
dc.subject | Glare | |
dc.subject | Humans | |
dc.subject | Male | |
dc.subject | Observer Variation | |
dc.subject | Prospective Studies | |
dc.subject | Reproducibility of Results | |
dc.subject | Scattering, Radiation | |
dc.subject | Sensitivity and Specificity | |
dc.subject | Vision Disorders | |
dc.title | Tablet App halometer for the assessment of dysphotopsia | |
dc.type | journal-article | |
dc.type | Journal Article | |
dc.type | Validation Study | |
plymouth.author-url | https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000368051300013&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=11bb513d99f797142bcfeffcc58ea008 | |
plymouth.issue | 11 | |
plymouth.volume | 41 | |
plymouth.publication-status | Published | |
plymouth.journal | Journal of Cataract and Refractive Surgery | |
dc.identifier.doi | 10.1016/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.place | United States | |
dcterms.dateAccepted | 2015-05-01 | |
dc.identifier.eissn | 1873-4502 | |
dc.rights.embargoperiod | No embargo | |
rioxxterms.versionofrecord | 10.1016/j.jcrs.2015.05.041 | |
rioxxterms.licenseref.uri | http://www.rioxx.net/licenses/all-rights-reserved | |
rioxxterms.licenseref.startdate | 2015-11 | |
rioxxterms.type | Journal Article/Review |