An Intraocular Lens Power Calculation Formula Based on Optical Coherence Tomography: A Pilot Study
Identifieur interne : 001080 ( Pmc/Curation ); précédent : 001079; suivant : 001081An Intraocular Lens Power Calculation Formula Based on Optical Coherence Tomography: A Pilot Study
Auteurs : Maolong Tang ; Yan Li ; David HuangSource :
- Journal of refractive surgery (Thorofare, N.J. : 1995) [ 1081-597X ] ; 2010.
Abstract
To develop an intraocular lens (IOL) power calculation formula based on optical coherence tomography (OCT) that would not be biased by previous laser vision correction.
Twenty-seven eyes of 27 cataract patients without prior laser vision correction who underwent phacoemulsification were included in the study. An optical coherence biometer (IOLMaster, Carl Zeiss Meditec) measured anterior corneal curvature and axial eye length. A high-speed (2000 Hz) anterior segment OCT prototype mapped corneal thickness and measured anterior chamber depth and crystalline lens thickness. Posterior corneal curvature was computed by combining IOLMaster keratometry with OCT corneal thickness mapping. A new IOL formula was developed based on these parameters. One month after phacoemulsification, the manifest refraction spherical equivalent (MRSE) was measured. The prediction error in postoperative MRSE of the OCT-based IOL formula was compared with that of three theoretic formulae: SRK/T, Hoffer Q, and Holladay II.
The mean prediction error in postoperative MRSE of the OCT-based formula was 0.04±0.44 diopters (D). The SRK/T was the best of the theoretic formulae, and its prediction error was −0.35±0.42 D. Twenty-one (78%) eyes were within 0.50 D using the OCT formula compared to 18 (67%) eyes using the SRK/T. No statistically significant differences were noted among the formulae.
For cataract patients without prior laser vision correction, the OCT-based IOL formula was as accurate as the current theoretic formulae. This new formula is based on direct OCT assessment of the posterior curvature and avoids the calculation errors inherent in conventional IOL formulae.
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DOI: 10.3928/1081597X-20090710-02
PubMed: 20677729
PubMed Central: 2916192
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">An Intraocular Lens Power Calculation Formula Based on Optical Coherence Tomography: A Pilot Study</title><author><name sortKey="Tang, Maolong" sort="Tang, Maolong" uniqKey="Tang M" first="Maolong" last="Tang">Maolong Tang</name></author><author><name sortKey="Li, Yan" sort="Li, Yan" uniqKey="Li Y" first="Yan" last="Li">Yan Li</name></author><author><name sortKey="Huang, David" sort="Huang, David" uniqKey="Huang D" first="David" last="Huang">David Huang</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">20677729</idno><idno type="pmc">2916192</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2916192</idno><idno type="RBID">PMC:2916192</idno><idno type="doi">10.3928/1081597X-20090710-02</idno><date when="2010">2010</date><idno type="wicri:Area/Pmc/Corpus">001080</idno><idno type="wicri:Area/Pmc/Curation">001080</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">An Intraocular Lens Power Calculation Formula Based on Optical Coherence Tomography: A Pilot Study</title><author><name sortKey="Tang, Maolong" sort="Tang, Maolong" uniqKey="Tang M" first="Maolong" last="Tang">Maolong Tang</name></author><author><name sortKey="Li, Yan" sort="Li, Yan" uniqKey="Li Y" first="Yan" last="Li">Yan Li</name></author><author><name sortKey="Huang, David" sort="Huang, David" uniqKey="Huang D" first="David" last="Huang">David Huang</name></author></analytic><series><title level="j">Journal of refractive surgery (Thorofare, N.J. : 1995)</title><idno type="ISSN">1081-597X</idno><imprint><date when="2010">2010</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec id="S1"><title>PURPOSE</title><p id="P1">To develop an intraocular lens (IOL) power calculation formula based on optical coherence tomography (OCT) that would not be biased by previous laser vision correction.</p></sec><sec sec-type="methods" id="S2"><title>METHODS</title><p id="P2">Twenty-seven eyes of 27 cataract patients without prior laser vision correction who underwent phacoemulsification were included in the study. An optical coherence biometer (IOLMaster, Carl Zeiss Meditec) measured anterior corneal curvature and axial eye length. A high-speed (2000 Hz) anterior segment OCT prototype mapped corneal thickness and measured anterior chamber depth and crystalline lens thickness. Posterior corneal curvature was computed by combining IOLMaster keratometry with OCT corneal thickness mapping. A new IOL formula was developed based on these parameters. One month after phacoemulsification, the manifest refraction spherical equivalent (MRSE) was measured. The prediction error in postoperative MRSE of the OCT-based IOL formula was compared with that of three theoretic formulae: SRK/T, Hoffer Q, and Holladay II.</p></sec><sec id="S3"><title>RESULTS</title><p id="P3">The mean prediction error in postoperative MRSE of the OCT-based formula was 0.04±0.44 diopters (D). The SRK/T was the best of the theoretic formulae, and its prediction error was −0.35±0.42 D. Twenty-one (78%) eyes were within 0.50 D using the OCT formula compared to 18 (67%) eyes using the SRK/T. No statistically significant differences were noted among the formulae.</p></sec><sec id="S4"><title>CONCLUSIONS</title><p id="P4">For cataract patients without prior laser vision correction, the OCT-based IOL formula was as accurate as the current theoretic formulae. This new formula is based on direct OCT assessment of the posterior curvature and avoids the calculation errors inherent in conventional IOL formulae.</p></sec></div></front></TEI><pmc article-type="research-article" xml:lang="EN"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<pmc-dir>properties manuscript</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-journal-id">9505927</journal-id><journal-id journal-id-type="pubmed-jr-id">20169</journal-id><journal-id journal-id-type="nlm-ta">J Refract Surg</journal-id><journal-title>Journal of refractive surgery (Thorofare, N.J. : 1995)</journal-title><issn pub-type="ppub">1081-597X</issn></journal-meta><article-meta><article-id pub-id-type="pmid">20677729</article-id><article-id pub-id-type="pmc">2916192</article-id><article-id pub-id-type="doi">10.3928/1081597X-20090710-02</article-id><article-id pub-id-type="manuscript">NIHMS218438</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>An Intraocular Lens Power Calculation Formula Based on Optical Coherence Tomography: A Pilot Study</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Tang</surname><given-names>Maolong</given-names></name><degrees>PhD</degrees></contrib><contrib contrib-type="author"><name><surname>Li</surname><given-names>Yan</given-names></name><degrees>PhD</degrees></contrib><contrib contrib-type="author"><name><surname>Huang</surname><given-names>David</given-names></name><degrees>MD, PhD</degrees></contrib><aff id="A1">Center for Ophthalmic Optics and Lasers, Doheny Eye Institute, and the Department of Ophthalmology, Keck School of Medicine, University of Southern California, Los Angeles, Calif</aff></contrib-group><author-notes><corresp id="FN1">Correspondence: David Huang, MD, PhD, 1450 San Pablo St, DEI 5702, Los Angeles, CA 90033. Tel: 323.442.6710; Fax: 323.442.6517; <email>dhuang@usc.edu</email></corresp></author-notes><pub-date pub-type="nihms-submitted"><day>8</day><month>7</month><year>2010</year></pub-date><pub-date pub-type="epub"><day>17</day><month>6</month><year>2010</year></pub-date><pub-date pub-type="ppub"><month>6</month><year>2010</year></pub-date><pub-date pub-type="pmc-release"><day>17</day><month>6</month><year>2011</year></pub-date><volume>26</volume><issue>6</issue><fpage>430</fpage><lpage>437</lpage><abstract><sec id="S1"><title>PURPOSE</title><p id="P1">To develop an intraocular lens (IOL) power calculation formula based on optical coherence tomography (OCT) that would not be biased by previous laser vision correction.</p></sec><sec sec-type="methods" id="S2"><title>METHODS</title><p id="P2">Twenty-seven eyes of 27 cataract patients without prior laser vision correction who underwent phacoemulsification were included in the study. An optical coherence biometer (IOLMaster, Carl Zeiss Meditec) measured anterior corneal curvature and axial eye length. A high-speed (2000 Hz) anterior segment OCT prototype mapped corneal thickness and measured anterior chamber depth and crystalline lens thickness. Posterior corneal curvature was computed by combining IOLMaster keratometry with OCT corneal thickness mapping. A new IOL formula was developed based on these parameters. One month after phacoemulsification, the manifest refraction spherical equivalent (MRSE) was measured. The prediction error in postoperative MRSE of the OCT-based IOL formula was compared with that of three theoretic formulae: SRK/T, Hoffer Q, and Holladay II.</p></sec><sec id="S3"><title>RESULTS</title><p id="P3">The mean prediction error in postoperative MRSE of the OCT-based formula was 0.04±0.44 diopters (D). The SRK/T was the best of the theoretic formulae, and its prediction error was −0.35±0.42 D. Twenty-one (78%) eyes were within 0.50 D using the OCT formula compared to 18 (67%) eyes using the SRK/T. No statistically significant differences were noted among the formulae.</p></sec><sec id="S4"><title>CONCLUSIONS</title><p id="P4">For cataract patients without prior laser vision correction, the OCT-based IOL formula was as accurate as the current theoretic formulae. This new formula is based on direct OCT assessment of the posterior curvature and avoids the calculation errors inherent in conventional IOL formulae.</p></sec></abstract><contract-num rid="EY1">R01 EY018184-03
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