Magnocellular visual function in developmental dyslexia: deficit in frequency-doubling perimetry and ocular motor skills
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Arquivos brasileiros de oftalmologia (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0004-27492021000500442 |
Resumo: | ABSTRACT Purpose: This study aimed to verify if patients with developmental dyslexia present deficits coherent with visual magnocellular dysfunction. Methods: Participants with confirmed diagnosis of developmental dyslexia (n=62; age range=8-25 years; mean age=13.8 years, standard deviation=3.9; 77% male) were compared to a control group with normal development, matched for age, sex, ocular dominance, visual acuity, and text comprehension. The frequency-doubling technology perimetry was used to evaluate the peripheral visual field contrast sensitivity threshold. The Visagraph III Eye-Movement Recording System was used to evaluate ocular motor skills during text reading. Results: The developmental dyslexia group had significantly worse contrast sensitivity in the frequency-doubling technology, with strong effect size, than the matched control group. The developmental dyslexia group had more eyes classified in the impaired range of sensitivity threshold to detect frequency-doubling illusion than the control group. Moreover, the developmental dyslexia group had poorer ocular motor skills and reading performance, revealed by a difference in ocular fixations, regressions, span recognition, reading rate, and relative efficiency between groups. A significant correlation was found between contrast sensitivity and ocular motor skills. Participants with good relative efficiency had significantly better contrast sensitivity than participants with poor relative efficiency. Conclusions: The developmental dyslexia group presented a markedly worse performance in visual variables related to visual magnocellular function (i.e., frequency-doubling technology perimetry and ocular motor skills) compared with a matched control group. Professionals need to be aware of the importance of evaluating vision of individuals with developmental dyslexia beyond visual acuity and including in their assessments instruments to evaluate temporal processing, with contrast sensitivity threshold. |
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Arquivos brasileiros de oftalmologia (Online) |
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Magnocellular visual function in developmental dyslexia: deficit in frequency-doubling perimetry and ocular motor skillsDyslexiaReadingVisual perceptionVision disordersOculomotor musclesEye movementsABSTRACT Purpose: This study aimed to verify if patients with developmental dyslexia present deficits coherent with visual magnocellular dysfunction. Methods: Participants with confirmed diagnosis of developmental dyslexia (n=62; age range=8-25 years; mean age=13.8 years, standard deviation=3.9; 77% male) were compared to a control group with normal development, matched for age, sex, ocular dominance, visual acuity, and text comprehension. The frequency-doubling technology perimetry was used to evaluate the peripheral visual field contrast sensitivity threshold. The Visagraph III Eye-Movement Recording System was used to evaluate ocular motor skills during text reading. Results: The developmental dyslexia group had significantly worse contrast sensitivity in the frequency-doubling technology, with strong effect size, than the matched control group. The developmental dyslexia group had more eyes classified in the impaired range of sensitivity threshold to detect frequency-doubling illusion than the control group. Moreover, the developmental dyslexia group had poorer ocular motor skills and reading performance, revealed by a difference in ocular fixations, regressions, span recognition, reading rate, and relative efficiency between groups. A significant correlation was found between contrast sensitivity and ocular motor skills. Participants with good relative efficiency had significantly better contrast sensitivity than participants with poor relative efficiency. Conclusions: The developmental dyslexia group presented a markedly worse performance in visual variables related to visual magnocellular function (i.e., frequency-doubling technology perimetry and ocular motor skills) compared with a matched control group. Professionals need to be aware of the importance of evaluating vision of individuals with developmental dyslexia beyond visual acuity and including in their assessments instruments to evaluate temporal processing, with contrast sensitivity threshold.Conselho Brasileiro de Oftalmologia2021-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0004-27492021000500442Arquivos Brasileiros de Oftalmologia v.84 n.5 2021reponame:Arquivos brasileiros de oftalmologia (Online)instname:Conselho Brasileiro de Oftalmologia (CBO)instacron:CBO10.5935/0004-2749.20210069info:eu-repo/semantics/openAccessVilhena,Douglas de AraújoGuimarães,Márcia ReisGuimarães,Ricardo QueirozPinheiro,Ângela Maria Vieiraeng2021-09-17T00:00:00Zoai:scielo:S0004-27492021000500442Revistahttp://aboonline.org.br/https://old.scielo.br/oai/scielo-oai.phpaboonline@cbo.com.br||abo@cbo.com.br1678-29250004-2749opendoar:2021-09-17T00:00Arquivos brasileiros de oftalmologia (Online) - Conselho Brasileiro de Oftalmologia (CBO)false |
dc.title.none.fl_str_mv |
Magnocellular visual function in developmental dyslexia: deficit in frequency-doubling perimetry and ocular motor skills |
title |
Magnocellular visual function in developmental dyslexia: deficit in frequency-doubling perimetry and ocular motor skills |
spellingShingle |
Magnocellular visual function in developmental dyslexia: deficit in frequency-doubling perimetry and ocular motor skills Vilhena,Douglas de Araújo Dyslexia Reading Visual perception Vision disorders Oculomotor muscles Eye movements |
title_short |
Magnocellular visual function in developmental dyslexia: deficit in frequency-doubling perimetry and ocular motor skills |
title_full |
Magnocellular visual function in developmental dyslexia: deficit in frequency-doubling perimetry and ocular motor skills |
title_fullStr |
Magnocellular visual function in developmental dyslexia: deficit in frequency-doubling perimetry and ocular motor skills |
title_full_unstemmed |
Magnocellular visual function in developmental dyslexia: deficit in frequency-doubling perimetry and ocular motor skills |
title_sort |
Magnocellular visual function in developmental dyslexia: deficit in frequency-doubling perimetry and ocular motor skills |
author |
Vilhena,Douglas de Araújo |
author_facet |
Vilhena,Douglas de Araújo Guimarães,Márcia Reis Guimarães,Ricardo Queiroz Pinheiro,Ângela Maria Vieira |
author_role |
author |
author2 |
Guimarães,Márcia Reis Guimarães,Ricardo Queiroz Pinheiro,Ângela Maria Vieira |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Vilhena,Douglas de Araújo Guimarães,Márcia Reis Guimarães,Ricardo Queiroz Pinheiro,Ângela Maria Vieira |
dc.subject.por.fl_str_mv |
Dyslexia Reading Visual perception Vision disorders Oculomotor muscles Eye movements |
topic |
Dyslexia Reading Visual perception Vision disorders Oculomotor muscles Eye movements |
description |
ABSTRACT Purpose: This study aimed to verify if patients with developmental dyslexia present deficits coherent with visual magnocellular dysfunction. Methods: Participants with confirmed diagnosis of developmental dyslexia (n=62; age range=8-25 years; mean age=13.8 years, standard deviation=3.9; 77% male) were compared to a control group with normal development, matched for age, sex, ocular dominance, visual acuity, and text comprehension. The frequency-doubling technology perimetry was used to evaluate the peripheral visual field contrast sensitivity threshold. The Visagraph III Eye-Movement Recording System was used to evaluate ocular motor skills during text reading. Results: The developmental dyslexia group had significantly worse contrast sensitivity in the frequency-doubling technology, with strong effect size, than the matched control group. The developmental dyslexia group had more eyes classified in the impaired range of sensitivity threshold to detect frequency-doubling illusion than the control group. Moreover, the developmental dyslexia group had poorer ocular motor skills and reading performance, revealed by a difference in ocular fixations, regressions, span recognition, reading rate, and relative efficiency between groups. A significant correlation was found between contrast sensitivity and ocular motor skills. Participants with good relative efficiency had significantly better contrast sensitivity than participants with poor relative efficiency. Conclusions: The developmental dyslexia group presented a markedly worse performance in visual variables related to visual magnocellular function (i.e., frequency-doubling technology perimetry and ocular motor skills) compared with a matched control group. Professionals need to be aware of the importance of evaluating vision of individuals with developmental dyslexia beyond visual acuity and including in their assessments instruments to evaluate temporal processing, with contrast sensitivity threshold. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-10-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0004-27492021000500442 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0004-27492021000500442 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.5935/0004-2749.20210069 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Conselho Brasileiro de Oftalmologia |
publisher.none.fl_str_mv |
Conselho Brasileiro de Oftalmologia |
dc.source.none.fl_str_mv |
Arquivos Brasileiros de Oftalmologia v.84 n.5 2021 reponame:Arquivos brasileiros de oftalmologia (Online) instname:Conselho Brasileiro de Oftalmologia (CBO) instacron:CBO |
instname_str |
Conselho Brasileiro de Oftalmologia (CBO) |
instacron_str |
CBO |
institution |
CBO |
reponame_str |
Arquivos brasileiros de oftalmologia (Online) |
collection |
Arquivos brasileiros de oftalmologia (Online) |
repository.name.fl_str_mv |
Arquivos brasileiros de oftalmologia (Online) - Conselho Brasileiro de Oftalmologia (CBO) |
repository.mail.fl_str_mv |
aboonline@cbo.com.br||abo@cbo.com.br |
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1754209031380008960 |