Utilize este identificador para referenciar este registo: http://hdl.handle.net/1822/17102

TítuloFixation in patients with juvenile macular disease
Autor(es)Macedo, António Filipe
Nascimento, Sérgio M. C.
Gomes, Augusto Oliveira Silva
Puga, André Teixeira
Palavras-chaveFixation stability
Preferred retinal locus
Eye movements
Eccentric fixation
Data30-Set-2007
EditoraLippincott, Williams & Wilkins
RevistaOptometry and Vision Science
Resumo(s)Purpose. The instability of fixation with central scotoma has been mainly studied in patients with age-related macular diseases (MDs). However, early macular lesions can lead to different characteristics of fixation. The aim of this work was to study fixation in patients with juvenile MD. Methods. Eye movements of 10 patients and 10 controls were monitored during fixation. Visual fields were assessed by static perimetry to determine the extent of the field defects. Eye movements were separated into saccades and drifts, with fixation stability assessed by bivariate contour ellipse area (BCEA). To quantify the number and location of preferred retinal loci (PRL), the kernel density estimator and expectation maximization for mixtures of gaussians were used. Results. Patients have worse fixation stability than controls and large BCEAs resulted in more than one PRL. It was found that central field defects (10°) have negative correlation with the size of BCEA. In addition, the meridian of saccades during fixation was correlated with the meridian inter-PRL. Conclusions. Patients with juvenile MDs have large BCEAs, frequently associated with two PRL. Similar results had been found for patients with age-related MDs. Also, the meridian of involuntary saccades during fixation was found to be correlated with the location of PRLs, suggesting a useful role of these movements in alternating between them.
Tipoarticle
URIhttp://hdl.handle.net/1822/17102
DOI10.1097/OPX.0b013e3181559beb
ISSN1040-5488
1538-9235
Versão da editorahttp://journals.lww.com/
Arbitragem científicayes
AcessoopenAccess
Aparece nas coleções:CDF - OCV - Artigos/Papers (with refereeing)

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
Macedo_2007_OVS_Fixation_in_Patients_with_Juvenile_Macular_Disease.11-1.pdfDocumento principal404,37 kBAdobe PDFVer/Abrir

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu Currículo DeGóis