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dc.contributor.authorDhallu, Sandeep K
dc.contributor.authorSheppard, Amy L
dc.contributor.authorDrew, Tom
dc.contributor.authorMihashi, Toshifumi
dc.contributor.authorZapata-Díaz, Juan F
dc.contributor.authorRadhakrishnan, Hema
dc.contributor.authorIskander, D Robert
dc.contributor.authorWolffsohn, James S
dc.date.accessioned2020-03-24T01:09:15Z
dc.date.available2020-03-24T01:09:15Z
dc.date.issued2019-06-28
dc.identifier.citationDhallu , S K , Sheppard , A L , Drew , T , Mihashi , T , Zapata-Díaz , J F , Radhakrishnan , H , Iskander , D R & Wolffsohn , J S 2019 , ' Factors Influencing Pseudo-Accommodation-The Difference between Subjectively Reported Range of Clear Focus and Objectively Measured Accommodation Range ' , Vision (Basel, Switzerland) , vol. 3 , no. 3 , 34 . https://doi.org/10.3390/vision3030034
dc.identifier.issn2411-5150
dc.identifier.otherPURE: 18743283
dc.identifier.otherPURE UUID: 87e2e769-aedd-4ed0-acca-95dfd876678f
dc.identifier.otherPubMed: 31735835
dc.identifier.otherPubMedCentral: PMC6802792
dc.identifier.otherScopus: 85079665811
dc.identifier.otherORCID: /0000-0001-5011-4469/work/89119130
dc.identifier.urihttp://hdl.handle.net/2299/22457
dc.description© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
dc.description.abstractThe key determinants of the range of clear focus in pre-presbyopes and their relative contributions to the difference between subjective range of focus and objective accommodation assessments have not been previously quantified. Fifty participants (aged 33.0 ± 6.4 years) underwent simultaneous monocular subjective (visual acuity measured with an electronic test-chart) and objective (dynamic accommodation measured with an Aston open-field aberrometer) defocus curve testing for lenses between +2.00 to -10.00 DS in +0.50 DS steps in a randomized order. Pupil diameter and ocular aberrations (converted to visual metrics normalized for pupil size) at each level of blur were measured. The difference between objective range over which the power of the crystalline lens changes and the subjective range of clear focus was quantified and the results modelled using pupil size, refractive error, tolerance to blur, and ocular aberrations. The subjective range of clear focus was principally accounted for by age (46.4%) and pupil size (19.3%). The objectively assessed accommodative range was also principally accounted for by age (27.6%) and pupil size (15.4%). Over one-quarter (26.0%) of the difference between objective accommodation and subjective range of clear focus was accounted for by age (14.0%) and spherical aberration at maximum accommodation (12.0%). There was no significant change in the objective accommodative response (F = 1.426, p = 0.229) or pupil size (F = 0.799, p = 0.554) of participants for levels of defocus above their amplitude of accommodation. Pre-presbyopes benefit from an increased subjective range of clear vision beyond their objective accommodation due in part to neural factors, resulting in a measured depth-of-focus of, on average, 1.0 D.en
dc.format.extent14
dc.language.isoeng
dc.relation.ispartofVision (Basel, Switzerland)
dc.titleFactors Influencing Pseudo-Accommodation-The Difference between Subjectively Reported Range of Clear Focus and Objectively Measured Accommodation Rangeen
dc.contributor.institutionDepartment of Clinical and Pharmaceutical Sciences
dc.contributor.institutionSchool of Life and Medical Sciences
dc.description.statusPeer reviewed
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.3390/vision3030034
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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