Effects of Earth-Fixed vs Head-Fixed Targets on Static Ocular Counterroll
Identifieur interne : 000784 ( Main/Exploration ); précédent : 000783; suivant : 000785Effects of Earth-Fixed vs Head-Fixed Targets on Static Ocular Counterroll
Auteurs : Manokaraananthan Chandrakumar [Canada] ; Zahra Hirji [Canada] ; Herbert C. Goltz [Canada] ; Giuseppe Mirabella [Canada] ; Alan W. Blakeman [Canada] ; Linda Colpa [Canada] ; Agnes M. F. Wong [Canada]Source :
- Archives of ophthalmology : (1960) [ 0003-9950 ] ; 2010.
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- Pascal (Inist)
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Abstract
Objective: To investigate whether static ocular counterroll (OCR) gain is reduced during viewing of an earth-fixed vs a head-fixed target. Methods: Twelve healthy individuals were recruited. The target consisted of a red fixation cross against a grid pattern at a viewing distance of 33 cm. The target was mounted on a wall (earth fixed) or was coupled to the head (head fixed). Changes in mean torsional eye position were plotted as a function of head position steps (0°±25° in 5° steps), and sigmoidal fits were performed. Mean static OCR gain was calculated by taking the derivative of the fitted functions. Results: Mean static OCR gain was 40% lower with a head-fixed target (-0.084) than with an earth-fixed target (-0.141) (P<.001). Conclusion: The reduction in static OCR gain during viewing of a head-fixed target indicates that static OCR is partially negated when a target moves with the head.
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Blakeman</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Department of Ophthalmology and Vision Sciences, University of Toronto</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><placeName><settlement type="city">Toronto</settlement><region type="state">Ontario</region></placeName><orgName type="university">Université de Toronto</orgName></affiliation></author><author><name sortKey="Colpa, Linda" sort="Colpa, Linda" uniqKey="Colpa L" first="Linda" last="Colpa">Linda Colpa</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Department of Ophthalmology and Vision Sciences, University of Toronto</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><placeName><settlement type="city">Toronto</settlement><region type="state">Ontario</region></placeName><orgName type="university">Université de Toronto</orgName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>The Hospital for Sick Children</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>The Hospital for Sick Children</wicri:noRegion></affiliation></author><author><name sortKey="Wong, Agnes M F" sort="Wong, Agnes M F" uniqKey="Wong A" first="Agnes M. F." last="Wong">Agnes M. F. Wong</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>University Health Network</s1><s2>Toronto, Ontario</s2><s3>CAN</s3><sZ>7 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>University Health Network</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">10-0226816</idno><date when="2010">2010</date><idno type="stanalyst">PASCAL 10-0226816 INIST</idno><idno type="RBID">Pascal:10-0226816</idno><idno type="wicri:Area/PascalFrancis/Corpus">000183</idno><idno type="wicri:Area/PascalFrancis/Curation">000594</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000158</idno><idno type="wicri:doubleKey">0003-9950:2010:Chandrakumar M:effects:of:earth</idno><idno type="wicri:Area/Main/Merge">000789</idno><idno type="wicri:Area/Main/Curation">000784</idno><idno type="wicri:Area/Main/Exploration">000784</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Effects of Earth-Fixed vs Head-Fixed Targets on Static Ocular Counterroll</title><author><name sortKey="Chandrakumar, Manokaraananthan" sort="Chandrakumar, Manokaraananthan" uniqKey="Chandrakumar M" first="Manokaraananthan" last="Chandrakumar">Manokaraananthan Chandrakumar</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Department of Ophthalmology and Vision Sciences, University of Toronto</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><placeName><settlement type="city">Toronto</settlement><region type="state">Ontario</region></placeName><orgName type="university">Université de Toronto</orgName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>The Hospital for Sick Children</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>The Hospital for Sick Children</wicri:noRegion></affiliation></author><author><name sortKey="Hirji, Zahra" sort="Hirji, Zahra" uniqKey="Hirji Z" first="Zahra" last="Hirji">Zahra Hirji</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Department of Ophthalmology and Vision Sciences, University of Toronto</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><placeName><settlement type="city">Toronto</settlement><region type="state">Ontario</region></placeName><orgName type="university">Université de Toronto</orgName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>The Hospital for Sick Children</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>The Hospital for Sick Children</wicri:noRegion></affiliation></author><author><name sortKey="Goltz, Herbert C" sort="Goltz, Herbert C" uniqKey="Goltz H" first="Herbert C." last="Goltz">Herbert C. Goltz</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Department of Ophthalmology and Vision Sciences, University of Toronto</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><placeName><settlement type="city">Toronto</settlement><region type="state">Ontario</region></placeName><orgName type="university">Université de Toronto</orgName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>The Hospital for Sick Children</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>The Hospital for Sick Children</wicri:noRegion></affiliation></author><author><name sortKey="Mirabella, Giuseppe" sort="Mirabella, Giuseppe" uniqKey="Mirabella G" first="Giuseppe" last="Mirabella">Giuseppe Mirabella</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Department of Ophthalmology and Vision Sciences, University of Toronto</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><placeName><settlement type="city">Toronto</settlement><region type="state">Ontario</region></placeName><orgName type="university">Université de Toronto</orgName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>The Hospital for Sick Children</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>The Hospital for Sick Children</wicri:noRegion></affiliation></author><author><name sortKey="Blakeman, Alan W" sort="Blakeman, Alan W" uniqKey="Blakeman A" first="Alan W." last="Blakeman">Alan W. Blakeman</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Department of Ophthalmology and Vision Sciences, University of Toronto</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><placeName><settlement type="city">Toronto</settlement><region type="state">Ontario</region></placeName><orgName type="university">Université de Toronto</orgName></affiliation></author><author><name sortKey="Colpa, Linda" sort="Colpa, Linda" uniqKey="Colpa L" first="Linda" last="Colpa">Linda Colpa</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Department of Ophthalmology and Vision Sciences, University of Toronto</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><placeName><settlement type="city">Toronto</settlement><region type="state">Ontario</region></placeName><orgName type="university">Université de Toronto</orgName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>The Hospital for Sick Children</s1><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>The Hospital for Sick Children</wicri:noRegion></affiliation></author><author><name sortKey="Wong, Agnes M F" sort="Wong, Agnes M F" uniqKey="Wong A" first="Agnes M. F." last="Wong">Agnes M. F. Wong</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>University Health Network</s1><s2>Toronto, Ontario</s2><s3>CAN</s3><sZ>7 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>University Health Network</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Archives of ophthalmology : (1960)</title><title level="j" type="abbreviated">Arch. ophthalmol. : (1960)</title><idno type="ISSN">0003-9950</idno><imprint><date when="2010">2010</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Archives of ophthalmology : (1960)</title><title level="j" type="abbreviated">Arch. ophthalmol. : (1960)</title><idno type="ISSN">0003-9950</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Comparative study</term><term>Eye</term><term>Head</term><term>Ocular</term><term>Ophthalmology</term><term>Statics</term><term>Target</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Etude comparative</term><term>Tête</term><term>Cible</term><term>Statique</term><term>Oculaire</term><term>Oeil</term><term>Ophtalmologie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Objective: To investigate whether static ocular counterroll (OCR) gain is reduced during viewing of an earth-fixed vs a head-fixed target. Methods: Twelve healthy individuals were recruited. The target consisted of a red fixation cross against a grid pattern at a viewing distance of 33 cm. The target was mounted on a wall (earth fixed) or was coupled to the head (head fixed). Changes in mean torsional eye position were plotted as a function of head position steps (0°±25° in 5° steps), and sigmoidal fits were performed. Mean static OCR gain was calculated by taking the derivative of the fitted functions. Results: Mean static OCR gain was 40% lower with a head-fixed target (-0.084) than with an earth-fixed target (-0.141) (P<.001). Conclusion: The reduction in static OCR gain during viewing of a head-fixed target indicates that static OCR is partially negated when a target moves with the head.</div></front></TEI><affiliations><list><country><li>Canada</li></country><region><li>Ontario</li></region><settlement><li>Toronto</li></settlement><orgName><li>Université de Toronto</li></orgName></list><tree><country name="Canada"><region name="Ontario"><name sortKey="Chandrakumar, Manokaraananthan" sort="Chandrakumar, Manokaraananthan" uniqKey="Chandrakumar M" first="Manokaraananthan" last="Chandrakumar">Manokaraananthan Chandrakumar</name></region><name sortKey="Blakeman, Alan W" sort="Blakeman, Alan W" uniqKey="Blakeman A" first="Alan W." last="Blakeman">Alan W. Blakeman</name><name sortKey="Chandrakumar, Manokaraananthan" sort="Chandrakumar, Manokaraananthan" uniqKey="Chandrakumar M" first="Manokaraananthan" last="Chandrakumar">Manokaraananthan Chandrakumar</name><name sortKey="Colpa, Linda" sort="Colpa, Linda" uniqKey="Colpa L" first="Linda" last="Colpa">Linda Colpa</name><name sortKey="Colpa, Linda" sort="Colpa, Linda" uniqKey="Colpa L" first="Linda" last="Colpa">Linda Colpa</name><name sortKey="Goltz, Herbert C" sort="Goltz, Herbert C" uniqKey="Goltz H" first="Herbert C." last="Goltz">Herbert C. Goltz</name><name sortKey="Goltz, Herbert C" sort="Goltz, Herbert C" uniqKey="Goltz H" first="Herbert C." last="Goltz">Herbert C. Goltz</name><name sortKey="Hirji, Zahra" sort="Hirji, Zahra" uniqKey="Hirji Z" first="Zahra" last="Hirji">Zahra Hirji</name><name sortKey="Hirji, Zahra" sort="Hirji, Zahra" uniqKey="Hirji Z" first="Zahra" last="Hirji">Zahra Hirji</name><name sortKey="Mirabella, Giuseppe" sort="Mirabella, Giuseppe" uniqKey="Mirabella G" first="Giuseppe" last="Mirabella">Giuseppe Mirabella</name><name sortKey="Mirabella, Giuseppe" sort="Mirabella, Giuseppe" uniqKey="Mirabella G" first="Giuseppe" last="Mirabella">Giuseppe Mirabella</name><name sortKey="Wong, Agnes M F" sort="Wong, Agnes M F" uniqKey="Wong A" first="Agnes M. F." last="Wong">Agnes M. F. Wong</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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