11127126

Source:http://linkedlifedata.com/resource/pubmed/id/11127126

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Predicate	Object
rdf:type	pubmed:Citation
lifeskim:mentions	umls-concept:C0034754, umls-concept:C0597198, umls-concept:C1280500, umls-concept:C1979874, umls-concept:C2347957, umls-concept:C2700177
pubmed:issue	6
pubmed:dateCreated	2000-12-13
pubmed:abstractText	For the reading task, contrast reserve is defined as the ratio of the letter contrast of the printed letters, to the reader's contrast threshold. Acuity reserve is the ratio of the print size used for the reading task, to the reader's visual acuity. The effects of low contrast reserve on reading performance were investigated at various magnifications, ranging from 3x to 7.5x, with the field of view systematically controlled. Eye movements were recorded whilst normally sighted subjects read using the magnifiers. It was shown that with adequate contrast reserve, increasing the field of view improved the reading rate because of the resulting increase in forward saccade length. Conversely, reducing the contrast reserve slowed the reading rate by decreasing the length of forward saccades and increasing the mean fixation duration, suggesting that the perceptual span is reduced at low contrast reserve. This study also shows that when the contrast reserve is low, providing magnification higher than that required for letter recognition (that is, increasing the acuity reserve) will not improve the reading performance. Furthermore, even when the contrast reserve was high, reading rates were lower for the magnifications of 5x and higher, because increases in saccade length do not match those of the retinal image size at these magnifications.
pubmed:language	eng
pubmed:journal	http://linkedlifedata.com/resource/pubmed/journal/8208839
pubmed:citationSubset	IM
pubmed:status	MEDLINE
pubmed:month	Nov
pubmed:issn	0275-5408
pubmed:author	pubmed-author:DickinsonC MCM, pubmed-author:MohammedZZ
pubmed:issnType	Print
pubmed:volume	20
pubmed:owner	NLM
pubmed:authorsComplete	Y
pubmed:pagination	464-72
pubmed:dateRevised	2006-11-7
pubmed:meshHeading	pubmed-meshheading:11127126-Contrast Sensitivity, pubmed-meshheading:11127126-Eye Movements, pubmed-meshheading:11127126-Humans, pubmed-meshheading:11127126-Reading, pubmed-meshheading:11127126-Saccades, pubmed-meshheading:11127126-Visual Acuity, pubmed-meshheading:11127126-Visual Fields
pubmed:year	2000
pubmed:articleTitle	The inter-relationship between magnification, field of view and contrast reserve: the effect on reading performance.
pubmed:affiliation	Department of Optometry, Faculty of Allied Health Science, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia.
pubmed:publicationType	Journal Article, Clinical Trial, Randomized Controlled Trial