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Article: Relationship between slow visual processing and reading speed in people with macular degeneration

TitleRelationship between slow visual processing and reading speed in people with macular degeneration
Authors
KeywordsCentral-field loss
Letter recognition
Macular degeneration
Peripheral vision
Reading speed
Temporal processing
Issue Date2007
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/visres
Citation
Vision Research, 2007, v. 47 n. 23, p. 2943-2955 How to Cite?
AbstractPurpose: People with macular degeneration (MD) often read slowly even with adequate magnification to compensate for acuity loss. Oculomotor deficits may affect reading in MD, but cannot fully explain the substantial reduction in reading speed. Central-field loss (CFL) is often a consequence of macular degeneration, necessitating the use of peripheral vision for reading. We hypothesized that slower temporal processing of visual patterns in peripheral vision is a factor contributing to slow reading performance in MD patients. Methods: Fifteen subjects with MD, including 12 with CFL, and five age-matched control subjects were recruited. Maximum reading speed and critical print size were measured with rapid serial visual presentation (RSVP). Temporal processing speed was studied by measuring letter-recognition accuracy for strings of three randomly selected letters centered at fixation for a range of exposure times. Temporal threshold was defined as the exposure time yielding 80% recognition accuracy for the central letter. Results: Temporal thresholds for the MD subjects ranged from 159 to 5881 ms, much longer than values for age-matched controls in central vision (13 ms, p < 0.01). The mean temporal threshold for the 11 MD subjects who used eccentric fixation (1555.8 ± 1708.4 ms) was much longer than the mean temporal threshold (97.0 ± 34.2 ms, p < 0.01) for the age-matched controls at 10° in the lower visual field. Individual temporal thresholds accounted for 30% of the variance in reading speed (p < 0.05). Conclusion: The significant association between increased temporal threshold for letter recognition and reduced reading speed is consistent with the hypothesis that slower visual processing of letter recognition is one of the factors limiting reading speed in MD subjects. © 2007 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/89565
ISSN
2015 Impact Factor: 1.776
2015 SCImago Journal Rankings: 0.957
PubMed Central ID
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorCheong, AMYen_HK
dc.contributor.authorLegge, GEen_HK
dc.contributor.authorLawrence, MGen_HK
dc.contributor.authorCheung, SHen_HK
dc.contributor.authorRuff, MAen_HK
dc.date.accessioned2010-09-06T09:58:38Z-
dc.date.available2010-09-06T09:58:38Z-
dc.date.issued2007en_HK
dc.identifier.citationVision Research, 2007, v. 47 n. 23, p. 2943-2955en_HK
dc.identifier.issn0042-6989en_HK
dc.identifier.urihttp://hdl.handle.net/10722/89565-
dc.description.abstractPurpose: People with macular degeneration (MD) often read slowly even with adequate magnification to compensate for acuity loss. Oculomotor deficits may affect reading in MD, but cannot fully explain the substantial reduction in reading speed. Central-field loss (CFL) is often a consequence of macular degeneration, necessitating the use of peripheral vision for reading. We hypothesized that slower temporal processing of visual patterns in peripheral vision is a factor contributing to slow reading performance in MD patients. Methods: Fifteen subjects with MD, including 12 with CFL, and five age-matched control subjects were recruited. Maximum reading speed and critical print size were measured with rapid serial visual presentation (RSVP). Temporal processing speed was studied by measuring letter-recognition accuracy for strings of three randomly selected letters centered at fixation for a range of exposure times. Temporal threshold was defined as the exposure time yielding 80% recognition accuracy for the central letter. Results: Temporal thresholds for the MD subjects ranged from 159 to 5881 ms, much longer than values for age-matched controls in central vision (13 ms, p < 0.01). The mean temporal threshold for the 11 MD subjects who used eccentric fixation (1555.8 ± 1708.4 ms) was much longer than the mean temporal threshold (97.0 ± 34.2 ms, p < 0.01) for the age-matched controls at 10° in the lower visual field. Individual temporal thresholds accounted for 30% of the variance in reading speed (p < 0.05). Conclusion: The significant association between increased temporal threshold for letter recognition and reduced reading speed is consistent with the hypothesis that slower visual processing of letter recognition is one of the factors limiting reading speed in MD subjects. © 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.subjectCentral-field lossen_HK
dc.subjectLetter recognitionen_HK
dc.subjectMacular degenerationen_HK
dc.subjectPeripheral visionen_HK
dc.subjectReading speeden_HK
dc.subjectTemporal processingen_HK
dc.titleRelationship between slow visual processing and reading speed in people with macular degenerationen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0042-6989&volume=47&issue=23&spage=2943&epage=2955&date=2007&atitle=Relationship+between+slow+visual+processing+and+reading+speed+in+people+with+macular+degenerationen_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.2007.07.010en_HK
dc.identifier.pmid17881032-
dc.identifier.pmcidPMC2094698-
dc.identifier.scopuseid_2-s2.0-34948836234en_HK
dc.identifier.hkuros140356en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34948836234&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume47en_HK
dc.identifier.issue23en_HK
dc.identifier.spage2943en_HK
dc.identifier.epage2955en_HK
dc.identifier.isiWOS:000250891500003-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridCheong, AMY=7003847650en_HK
dc.identifier.scopusauthoridLegge, GE=7005064208en_HK
dc.identifier.scopusauthoridLawrence, MG=8410649400en_HK
dc.identifier.scopusauthoridCheung, SH=7202473508en_HK
dc.identifier.scopusauthoridRuff, MA=22235672200en_HK
dc.identifier.citeulike3680636-

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