Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/16412

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dc.contributor.authorFerreira, Andreia-
dc.contributor.authorLira, Madalena-
dc.contributor.authorFranco, Sandra-
dc.date.accessioned2012-01-13T17:48:41Z-
dc.date.available2012-01-13T17:48:41Z-
dc.date.issued2011-
dc.identifier.isbn9780819485755por
dc.identifier.issn0277-786Xpor
dc.identifier.urihttp://hdl.handle.net/1822/16412-
dc.description.abstractThe aim of this work was to find out if differences exist in accommodative and convergence response for different computer monitors’ and a printed text. It was also tried to relate the horizontal heterophoria value and accommodative response with the symptoms associated with computer use. Two independents experiments were carried out in this study. The first experiment was measuring the accommodative response on 89 subjects using the Grand Seiko WAM-5500 (Grand Seiko Co., Ltd., Japan). The accommodative response was measured using three computer monitors: a 17-inch cathode ray tube (CRT), two liquid crystal displays LCDs, one 17-inch (LCD17) and one 15 inches (LCD15) and a printed text. The text displayed was always the same for all the subjects and tests. A second experiment aimed to measure the value of habitual horizontal heterophoria on 80 subjects using the Von Graefe technique. The measurements were obtained using the same target presented on two different computer monitors, one 19-inch cathode ray tube (CRT) and other 19 inches liquid crystal displays (LCD) and printed on paper. A small survey about the incidence and prevalence of symptoms was performed similarly in both experiments. In the first experiment, the accommodation response was higher in the CRT and LCD's than for paper. There were not found significantly different response for both LCD monitors’. The second experiment showed that, the heterophoria values were similar for all the stimuli. On average, participants presented a small exophoria. In both experiments, asthenopia was the symptom that presented higher incidence. There are different accommodative responses when reading on paper or on computer monitors. This difference is more significant for CRT monitors. On the other hand, there was no difference in the values of convergence for the computer monitors’ and paper. The symptoms associated with the use of computers are not related with the increase in accommodation and with the horizontal heterophoria values.por
dc.description.sponsorshipFundação para a Ciência e a Tecnologia (FCT)por
dc.language.isoengpor
dc.publisherSociety of Photo-optical Instrumentation Engineerspor
dc.rightsrestrictedAccesspor
dc.subjectAccommodative responsepor
dc.subjectConvergencepor
dc.subjectOcular symptomspor
dc.subjectComputer vision syndromepor
dc.titleAccommodative and convergence response to computer screen and printed textpor
dc.typeconferencePaper-
dc.peerreviewedyespor
sdum.publicationstatuspublishedpor
oaire.citationConferenceDate3 Mai - 7 Mai, 2011por
oaire.citationConferencePlaceBraga, Portugalpor
oaire.citationTitleInternational Conference Applications of Optics and Photonicspor
oaire.citationVolume8001por
dc.identifier.doi10.1117/12.892067por
dc.subject.wosScience & Technologypor
sdum.journalProceedings of SPIEpor
sdum.conferencePublicationInternational Conference Applications of Optics and Photonicspor
Appears in Collections:CDF - OCV - Comunicações/Communications (with refereeing)

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