Estimation of effective lens position using a method independent of preoperative keratometry readings.

Hdl Handle:
http://hdl.handle.net/10147/207946
Title:
Estimation of effective lens position using a method independent of preoperative keratometry readings.
Authors:
Dooley, Ian; Charalampidou, Sofia; Nolan, John; Loughman, James; Molloy, Laura; Beatty, Stephen
Affiliation:
Department of Ophthalmology, Waterford Regional Hospital, Institute of Eye, Surgery, Dublin, Ireland. iandooley@eustace.net
Citation:
J Cataract Refract Surg. 2011 Mar;37(3):506-12.
Journal:
Journal of cataract and refractive surgery
Issue Date:
1-Feb-2012
URI:
http://hdl.handle.net/10147/207946
DOI:
10.1016/j.jcrs.2010.09.027
PubMed ID:
21333875
Abstract:
PURPOSE: To evaluate the validity of a keratometry (K)-independent method of estimating effective lens position (ELP) before phacoemulsification cataract surgery. SETTING: Institute of Eye Surgery, Whitfield Clinic, Waterford, Ireland. DESIGN: Evaluation of diagnostic test or technology. METHODS: The anterior chamber diameter and corneal height in eyes scheduled for cataract surgery were measured with a rotating Scheimpflug camera. Corneal height and anterior chamber diameter were used to estimate the ELP in a K-independent method (using the SRK/T [ELP(rs)] and Holladay 1 [ELP(rh)] formulas). RESULTS: The mean ELP was calculated using the traditional (mean ELP(s) 5.59 mm +/- 0.52 mm [SD]; mean ELP(h) 5.63 +/- 0.42 mm) and K-independent (mean ELP(rs) 5.55 +/- 0.42 mm; mean ELP(rh) +/- SD 5.60 +/- 0.36 mm) methods. Agreement between ELP(s) and ELP(rs) and between ELP(h) and ELP(rh) were represented by Bland-Altman plots, with mean differences (+/- 1.96 SD) of 0.06 +/- 0.65 mm (range -0.59 to +0.71 mm; P=.08) in association with ELP(rs) and -0.04 +/- 0.39 mm (range -0.43 to +0.35 mm; P=.08) in association with ELP(rh). The mean absolute error for ELP(s) versus ELP(rs) estimation and for ELP(h) versus ELP(rh) estimation was 0.242 +/- 0.222 mm (range 0.001 to 1.272 mm) and 0.152 +/- 0.137 mm (range 0.001 to 0.814 mm), respectively. CONCLUSION: This study confirms that the K-independent ELP estimation method is comparable to traditional K-dependent methods and may be useful in post-refractive surgery patients.
Language:
eng
MeSH:
Adult; Aged; Aged, 80 and over; Anterior Chamber/*pathology; Biometry; Capsulorhexis; Cataract/*pathology; Cornea/*pathology; *Diagnostic Techniques, Ophthalmological; Humans; Lens Implantation, Intraocular; *Lenses, Intraocular; Middle Aged; *Phacoemulsification; Photography; Prospective Studies; Refraction, Ocular/physiology; Visual Acuity/physiology
ISSN:
1873-4502 (Electronic); 0886-3350 (Linking)

Full metadata record

DC FieldValue Language
dc.contributor.authorDooley, Ianen_GB
dc.contributor.authorCharalampidou, Sofiaen_GB
dc.contributor.authorNolan, Johnen_GB
dc.contributor.authorLoughman, Jamesen_GB
dc.contributor.authorMolloy, Lauraen_GB
dc.contributor.authorBeatty, Stephenen_GB
dc.date.accessioned2012-02-01T10:52:12Z-
dc.date.available2012-02-01T10:52:12Z-
dc.date.issued2012-02-01T10:52:12Z-
dc.identifier.citationJ Cataract Refract Surg. 2011 Mar;37(3):506-12.en_GB
dc.identifier.issn1873-4502 (Electronic)en_GB
dc.identifier.issn0886-3350 (Linking)en_GB
dc.identifier.pmid21333875en_GB
dc.identifier.doi10.1016/j.jcrs.2010.09.027en_GB
dc.identifier.urihttp://hdl.handle.net/10147/207946-
dc.description.abstractPURPOSE: To evaluate the validity of a keratometry (K)-independent method of estimating effective lens position (ELP) before phacoemulsification cataract surgery. SETTING: Institute of Eye Surgery, Whitfield Clinic, Waterford, Ireland. DESIGN: Evaluation of diagnostic test or technology. METHODS: The anterior chamber diameter and corneal height in eyes scheduled for cataract surgery were measured with a rotating Scheimpflug camera. Corneal height and anterior chamber diameter were used to estimate the ELP in a K-independent method (using the SRK/T [ELP(rs)] and Holladay 1 [ELP(rh)] formulas). RESULTS: The mean ELP was calculated using the traditional (mean ELP(s) 5.59 mm +/- 0.52 mm [SD]; mean ELP(h) 5.63 +/- 0.42 mm) and K-independent (mean ELP(rs) 5.55 +/- 0.42 mm; mean ELP(rh) +/- SD 5.60 +/- 0.36 mm) methods. Agreement between ELP(s) and ELP(rs) and between ELP(h) and ELP(rh) were represented by Bland-Altman plots, with mean differences (+/- 1.96 SD) of 0.06 +/- 0.65 mm (range -0.59 to +0.71 mm; P=.08) in association with ELP(rs) and -0.04 +/- 0.39 mm (range -0.43 to +0.35 mm; P=.08) in association with ELP(rh). The mean absolute error for ELP(s) versus ELP(rs) estimation and for ELP(h) versus ELP(rh) estimation was 0.242 +/- 0.222 mm (range 0.001 to 1.272 mm) and 0.152 +/- 0.137 mm (range 0.001 to 0.814 mm), respectively. CONCLUSION: This study confirms that the K-independent ELP estimation method is comparable to traditional K-dependent methods and may be useful in post-refractive surgery patients.en_GB
dc.language.isoengen_GB
dc.subject.meshAdulten_GB
dc.subject.meshAgeden_GB
dc.subject.meshAged, 80 and overen_GB
dc.subject.meshAnterior Chamber/*pathologyen_GB
dc.subject.meshBiometryen_GB
dc.subject.meshCapsulorhexisen_GB
dc.subject.meshCataract/*pathologyen_GB
dc.subject.meshCornea/*pathologyen_GB
dc.subject.mesh*Diagnostic Techniques, Ophthalmologicalen_GB
dc.subject.meshHumansen_GB
dc.subject.meshLens Implantation, Intraocularen_GB
dc.subject.mesh*Lenses, Intraocularen_GB
dc.subject.meshMiddle Ageden_GB
dc.subject.mesh*Phacoemulsificationen_GB
dc.subject.meshPhotographyen_GB
dc.subject.meshProspective Studiesen_GB
dc.subject.meshRefraction, Ocular/physiologyen_GB
dc.subject.meshVisual Acuity/physiologyen_GB
dc.titleEstimation of effective lens position using a method independent of preoperative keratometry readings.en_GB
dc.contributor.departmentDepartment of Ophthalmology, Waterford Regional Hospital, Institute of Eye, Surgery, Dublin, Ireland. iandooley@eustace.neten_GB
dc.identifier.journalJournal of cataract and refractive surgeryen_GB
dc.description.provinceMunster-

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