Evaluation of an open-field autorefractor's ability to measure refraction and hence potential to assess objective accommodation in pseudophakes
Identifieur interne : 004108 ( Istex/Corpus ); précédent : 004107; suivant : 004109Evaluation of an open-field autorefractor's ability to measure refraction and hence potential to assess objective accommodation in pseudophakes
Auteurs : James Stuart Wolffsohn ; Leon Nicholas Davies ; Shehzad Anjam Naroo ; Phillip Jonathan Buckhurst ; George Anthony Gibson ; Navneet Gupta ; Jennifer Patricia Craig ; Sunil ShahSource :
- British Journal of Ophthalmology [ 0007-1161 ] ; 2011-04.
Abstract
Background To evaluate the accuracy of an open-field autorefractor compared with subjective refraction in pseudophakes and hence its ability to assess objective eye focus with intraocular lenses (IOLs). Methods Objective refraction was measured at 6 m using the Shin-Nippon NVision-K 5001/Grand Seiko WR-5100K open-field autorefractor (five repeats) and by subjective refraction on 141 eyes implanted with a spherical (Softec1 n=53), aspherical (SoftecHD n=37) or accommodating (1CU n=22; Tetraflex n=29) IOL. Autorefraction was repeated 2 months later. Results The autorefractor prescription was similar (average difference: 0.09±0.53 D; p=0.19) to that found by subjective refraction, with ∼71% within ±0.50 D. The horizontal cylindrical components were similar (difference: 0.00±0.39 D; p=0.96), although the oblique (J45) autorefractor cylindrical vector was slightly more negative (by −0.06±0.25 D; p=0.06) than the subjective refraction. The results were similar for each of the IOL designs except for the spherical IOL, where the mean spherical equivalent difference between autorefraction and subjective was more hypermetropic than the Tetraflex accommodating IOL (F=2.77, p=0.04). The intrasession repeatability was <0.55 D (95% CI) and intersession repeatability <0.50 D in ≥85%. Conclusions The autorefractor gives valid and repeatable measures of pseudophakic eye refraction and hence objective accommodation.
Url:
DOI: 10.1136/bjo.2010.185009
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<front><div type="abstract">Background To evaluate the accuracy of an open-field autorefractor compared with subjective refraction in pseudophakes and hence its ability to assess objective eye focus with intraocular lenses (IOLs). Methods Objective refraction was measured at 6 m using the Shin-Nippon NVision-K 5001/Grand Seiko WR-5100K open-field autorefractor (five repeats) and by subjective refraction on 141 eyes implanted with a spherical (Softec1 n=53), aspherical (SoftecHD n=37) or accommodating (1CU n=22; Tetraflex n=29) IOL. Autorefraction was repeated 2 months later. Results The autorefractor prescription was similar (average difference: 0.09±0.53 D; p=0.19) to that found by subjective refraction, with ∼71% within ±0.50 D. The horizontal cylindrical components were similar (difference: 0.00±0.39 D; p=0.96), although the oblique (J45) autorefractor cylindrical vector was slightly more negative (by −0.06±0.25 D; p=0.06) than the subjective refraction. The results were similar for each of the IOL designs except for the spherical IOL, where the mean spherical equivalent difference between autorefraction and subjective was more hypermetropic than the Tetraflex accommodating IOL (F=2.77, p=0.04). The intrasession repeatability was <0.55 D (95% CI) and intersession repeatability <0.50 D in ≥85%. Conclusions The autorefractor gives valid and repeatable measures of pseudophakic eye refraction and hence objective accommodation.</div>
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<article-meta><article-id pub-id-type="publisher-id">bjophthalmol185009</article-id>
<article-id pub-id-type="doi">10.1136/bjo.2010.185009</article-id>
<article-id pub-id-type="other">bjophthalmol;95/4/498</article-id>
<article-id pub-id-type="other">bjophthalmol;bjo.2010.185009</article-id>
<article-id pub-id-type="pmid">20657018</article-id>
<article-id pub-id-type="other">498</article-id>
<article-id pub-id-type="other">bjo.2010.185009</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Clinical science</subject>
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<series-title>Original article</series-title>
</article-categories>
<title-group><article-title>Evaluation of an open-field autorefractor's ability to measure refraction and hence potential to assess objective accommodation in pseudophakes</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" corresp="yes"><name><surname>Wolffsohn</surname>
<given-names>James Stuart</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Davies</surname>
<given-names>Leon Nicholas</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Naroo</surname>
<given-names>Shehzad Anjam</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Buckhurst</surname>
<given-names>Phillip Jonathan</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Gibson</surname>
<given-names>George Anthony</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Gupta</surname>
<given-names>Navneet</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Craig</surname>
<given-names>Jennifer Patricia</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
<xref ref-type="aff" rid="aff2">2</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Shah</surname>
<given-names>Sunil</given-names>
</name>
<xref ref-type="aff" rid="aff1">1</xref>
<xref ref-type="aff" rid="aff3">3</xref>
<xref ref-type="aff" rid="aff4">4</xref>
</contrib>
</contrib-group>
<aff id="aff1"><label>1</label>
Aston University, School of Life and Health Sciences, Ophthalmic Research Group, Birmingham, UK</aff>
<aff id="aff2"><label>2</label>
Department of Ophthalmology, University of Auckland, Auckland, New Zealand</aff>
<aff id="aff3"><label>3</label>
Midland Eye Institute, Birmingham, UK</aff>
<aff id="aff4"><label>4</label>
Birmingham and Midland Eye Centre, Birmingham, UK</aff>
<author-notes><corresp><label>Correspondence to</label>
Professor James Stuart Wolffsohn, Aston University, Life and Health Sciences, Ophthalmic Research Group, Aston Triangle, Birmingham B4 7ET, UK; <email>j.s.w.wolffsohn@aston.ac.uk</email>
</corresp>
</author-notes>
<pub-date pub-type="epub-original"><day>23</day>
<month>7</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="ppub"><month>4</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub"><day>23</day>
<month>7</month>
<year>2010</year>
</pub-date>
<volume>95</volume>
<volume-id pub-id-type="other">95</volume-id>
<volume-id pub-id-type="other">95</volume-id>
<issue>4</issue>
<issue-id pub-id-type="other">bjophthalmol;95/4</issue-id>
<issue-id pub-id-type="other">4</issue-id>
<issue-id pub-id-type="other">95/4</issue-id>
<fpage>498</fpage>
<history><date date-type="accepted"><day>27</day>
<month>5</month>
<year>2010</year>
</date>
</history>
<permissions><copyright-statement>© 2011, Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.</copyright-statement>
<copyright-year>2011</copyright-year>
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<abstract><sec><title>Background</title>
<p>To evaluate the accuracy of an open-field autorefractor compared with subjective refraction in pseudophakes and hence its ability to assess objective eye focus with intraocular lenses (IOLs).</p>
</sec>
<sec><title>Methods</title>
<p>Objective refraction was measured at 6 m using the Shin-Nippon NVision-K 5001/Grand Seiko WR-5100K open-field autorefractor (five repeats) and by subjective refraction on 141 eyes implanted with a spherical (Softec1 n=53), aspherical (SoftecHD n=37) or accommodating (1CU n=22; Tetraflex n=29) IOL. Autorefraction was repeated 2 months later.</p>
</sec>
<sec><title>Results</title>
<p>The autorefractor prescription was similar (average difference: 0.09±0.53 D; p=0.19) to that found by subjective refraction, with ∼71% within ±0.50 D. The horizontal cylindrical components were similar (difference: 0.00±0.39 D; p=0.96), although the oblique (J<sub>45</sub>
) autorefractor cylindrical vector was slightly more negative (by −0.06±0.25 D; p=0.06) than the subjective refraction. The results were similar for each of the IOL designs except for the spherical IOL, where the mean spherical equivalent difference between autorefraction and subjective was more hypermetropic than the Tetraflex accommodating IOL (F=2.77, p=0.04). The intrasession repeatability was <0.55 D (95% CI) and intersession repeatability <0.50 D in ≥85%.</p>
</sec>
<sec><title>Conclusions</title>
<p>The autorefractor gives valid and repeatable measures of pseudophakic eye refraction and hence objective accommodation.</p>
</sec>
</abstract>
<kwd-group><kwd>Intraocular lens</kwd>
<kwd>pseudophakia</kwd>
<kwd>objective accommodation</kwd>
<kwd>autorefractor</kwd>
<kwd>lens and zonules</kwd>
<kwd>optics and refraction</kwd>
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<name type="personal"><namePart type="given">Shehzad Anjam</namePart>
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<name type="personal"><namePart type="given">Phillip Jonathan</namePart>
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<name type="personal"><namePart type="given">Jennifer Patricia</namePart>
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<affiliation>Department of Ophthalmology, University of Auckland, Auckland, New Zealand</affiliation>
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<name type="personal"><namePart type="given">Sunil</namePart>
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<affiliation>Midland Eye Institute, Birmingham, UK</affiliation>
<affiliation>Birmingham and Midland Eye Centre, Birmingham, UK</affiliation>
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<abstract>Background To evaluate the accuracy of an open-field autorefractor compared with subjective refraction in pseudophakes and hence its ability to assess objective eye focus with intraocular lenses (IOLs). Methods Objective refraction was measured at 6 m using the Shin-Nippon NVision-K 5001/Grand Seiko WR-5100K open-field autorefractor (five repeats) and by subjective refraction on 141 eyes implanted with a spherical (Softec1 n=53), aspherical (SoftecHD n=37) or accommodating (1CU n=22; Tetraflex n=29) IOL. Autorefraction was repeated 2 months later. Results The autorefractor prescription was similar (average difference: 0.09±0.53 D; p=0.19) to that found by subjective refraction, with ∼71% within ±0.50 D. The horizontal cylindrical components were similar (difference: 0.00±0.39 D; p=0.96), although the oblique (J45) autorefractor cylindrical vector was slightly more negative (by −0.06±0.25 D; p=0.06) than the subjective refraction. The results were similar for each of the IOL designs except for the spherical IOL, where the mean spherical equivalent difference between autorefraction and subjective was more hypermetropic than the Tetraflex accommodating IOL (F=2.77, p=0.04). The intrasession repeatability was <0.55 D (95% CI) and intersession repeatability <0.50 D in ≥85%. Conclusions The autorefractor gives valid and repeatable measures of pseudophakic eye refraction and hence objective accommodation.</abstract>
<subject><genre>Keywords</genre>
<topic>Intraocular lens</topic>
<topic>pseudophakia</topic>
<topic>objective accommodation</topic>
<topic>autorefractor</topic>
<topic>lens and zonules</topic>
<topic>optics and refraction</topic>
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