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Article: The effect of dioptric blur on reading performance

TitleThe effect of dioptric blur on reading performance
Authors
KeywordsBlur
Defocus
Reading
Issue Date2007
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/visres
Citation
Vision Research, 2007, v. 47 n. 12, p. 1584-1594 How to Cite?
AbstractLittle is known about the systematic impact of blur on reading performance. The purpose of this study was to quantify the effect of dioptric blur on reading performance in a group of normally sighted young adults. We measured monocular reading performance and visual acuity for 19 observers with normal vision, for five levels of optical blur (no-blur, 0.5, 1, 2, and 3D). Dioptric blur was induced using convex trial lenses placed in front of the testing eye, with the pupil dilated and in the presence of a 3 mm artificial pupil. Reading performance was assessed using eight versions of the MNREAD Acuity Chart. For each level of dioptric blur, observers read aloud sentences on one of these charts, from large to small print. Reading time for each sentence and the number of errors made were recorded and converted to reading speed in words per minute. Visual acuity was measured using 4-orientation Landolt C stimuli. For all levels of dioptric blur, reading speed increased with print size up to a certain print size and then remained constant at the maximum reading speed. By fitting nonlinear mixed-effects models, we found that the maximum reading speed was minimally affected by blur up to 2D, but was ∼23% slower for 3D of blur. When the amount of blur increased from 0 (no-blur) to 3D, the threshold print size (print size corresponded to 80% of the maximum reading speed) increased from 0.01 to 0.88 logMAR, reading acuity worsened from -0.16 to 0.58 logMAR, and visual acuity worsened from -0.19 to 0.64 logMAR. The similar rates of change with blur for threshold print size, reading acuity and visual acuity implicates that visual acuity is a good predictor of threshold print size and reading acuity. Like visual acuity, reading performance is susceptible to the degrading effect of optical blur. For increasing amount of blur, larger print sizes are required to attain the maximum reading speed. © 2007 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/89535
ISSN
2015 Impact Factor: 1.776
2015 SCImago Journal Rankings: 0.957
PubMed Central ID
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChung, STLen_HK
dc.contributor.authorJarvis, SHen_HK
dc.contributor.authorCheung, SHen_HK
dc.date.accessioned2010-09-06T09:58:16Z-
dc.date.available2010-09-06T09:58:16Z-
dc.date.issued2007en_HK
dc.identifier.citationVision Research, 2007, v. 47 n. 12, p. 1584-1594en_HK
dc.identifier.issn0042-6989en_HK
dc.identifier.urihttp://hdl.handle.net/10722/89535-
dc.description.abstractLittle is known about the systematic impact of blur on reading performance. The purpose of this study was to quantify the effect of dioptric blur on reading performance in a group of normally sighted young adults. We measured monocular reading performance and visual acuity for 19 observers with normal vision, for five levels of optical blur (no-blur, 0.5, 1, 2, and 3D). Dioptric blur was induced using convex trial lenses placed in front of the testing eye, with the pupil dilated and in the presence of a 3 mm artificial pupil. Reading performance was assessed using eight versions of the MNREAD Acuity Chart. For each level of dioptric blur, observers read aloud sentences on one of these charts, from large to small print. Reading time for each sentence and the number of errors made were recorded and converted to reading speed in words per minute. Visual acuity was measured using 4-orientation Landolt C stimuli. For all levels of dioptric blur, reading speed increased with print size up to a certain print size and then remained constant at the maximum reading speed. By fitting nonlinear mixed-effects models, we found that the maximum reading speed was minimally affected by blur up to 2D, but was ∼23% slower for 3D of blur. When the amount of blur increased from 0 (no-blur) to 3D, the threshold print size (print size corresponded to 80% of the maximum reading speed) increased from 0.01 to 0.88 logMAR, reading acuity worsened from -0.16 to 0.58 logMAR, and visual acuity worsened from -0.19 to 0.64 logMAR. The similar rates of change with blur for threshold print size, reading acuity and visual acuity implicates that visual acuity is a good predictor of threshold print size and reading acuity. Like visual acuity, reading performance is susceptible to the degrading effect of optical blur. For increasing amount of blur, larger print sizes are required to attain the maximum reading speed. © 2007 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/visresen_HK
dc.relation.ispartofVision Researchen_HK
dc.subjectBluren_HK
dc.subjectDefocusen_HK
dc.subjectReadingen_HK
dc.titleThe effect of dioptric blur on reading performanceen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0042-6989&volume=47&issue=12&spage=1584&epage=1594&date=2007&atitle=The+effect+of+dioptric+blur+on+reading+performanceen_HK
dc.identifier.emailCheung, SH:singhang@hku.hken_HK
dc.identifier.authorityCheung, SH=rp00590en_HK
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1016/j.visres.2007.03.007en_HK
dc.identifier.pmid17442363-
dc.identifier.pmcidPMC3572218-
dc.identifier.scopuseid_2-s2.0-34247862241en_HK
dc.identifier.hkuros133024en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34247862241&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume47en_HK
dc.identifier.issue12en_HK
dc.identifier.spage1584en_HK
dc.identifier.epage1594en_HK
dc.identifier.isiWOS:000247058300003-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridChung, STL=10440472700en_HK
dc.identifier.scopusauthoridJarvis, SH=16301286300en_HK
dc.identifier.scopusauthoridCheung, SH=7202473508en_HK

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