Value of dual biometry in the detection and investigation of error in the preoperative prediction of refractive status following cataract surgery.

Hdl Handle:
http://hdl.handle.net/10147/207955
Title:
Value of dual biometry in the detection and investigation of error in the preoperative prediction of refractive status following cataract surgery.
Authors:
Charalampidou, Sofia; Dooley, Ian; Molloy, Laura; Beatty, Stephen
Affiliation:
Department of Ophthalmology, Waterford Regional Hospital, Waterford, Ireland., sonia.sofia1@gmail.com
Citation:
Clin Experiment Ophthalmol. 2010 Apr;38(3):255-65.
Journal:
Clinical & experimental ophthalmology
Issue Date:
1-Feb-2012
URI:
http://hdl.handle.net/10147/207955
DOI:
10.1111/j.1442-9071.2010.02211.x
PubMed ID:
20447121
Abstract:
PURPOSE: To report the value of dual biometry in the detection of biometry errors. METHODS: Study 1: retrospective study of 224 consecutive cataract operations. The intraocular lens power calculation was based on immersion biometry. Study 2: immersion biometry was compared with optical coherence biometry (OCB) in terms of axial length, anterior chamber depth, keratometry readings and the recommended lens power to achieve emmetropia. Study 3: prospective study of 61 consecutive cataract operations. Both immersion and OCB were performed, but lens power calculation was based on the latter. RESULTS: Study 1: 115 (86%), 101 (75.4%), 90 (67.2%) and 50 (37.3%) of postoperative spherical equivalents were within +/-1.5 dioptres (D), +/-1.25 D, +/-1 D and +/-0.5 D of the target, respectively. Study 2: excellent agreement between axial length readings, anterior chamber depth readings and keratometry readings by immersion biometry and OCB was observed (reflected in a mean bias of -0.065 mm, -0.048 mm and +0.1803 D, respectively, in association with OCB). Agreement between the lens power recommended by each technique to achieve emmetropia was poor (mean bias of +1.16 D in association with OCB), but improved following appropriate modification of lens constants in the Accutome A-scan software (mean bias with OCB = -0.4 D). Study 3: 37 (92.5%) and 23 (57.5%) of operated eyes achieved a postoperative refraction within +/-1 D and +/-0.5 D of target, respectively. CONCLUSION: Systematic errors in biometry can exist, in the presence of acceptable postoperative refractive results. Dual biometry allows each biometric parameter to be scrutinized in isolation, and identify sources of error that may otherwise go undetected.
Language:
eng
MeSH:
Biometry/methods; Cataract Extraction/*methods; Humans; Intraoperative Period; Lens Implantation, Intraocular/*statistics & numerical data; Monitoring, Intraoperative; Postoperative Period; Predictive Value of Tests; Preoperative Care; Refraction, Ocular/physiology; Refractive Errors/*physiopathology/*therapy/ultrasonography; Retrospective Studies; Treatment Outcome; Ultrasonography/methods
ISSN:
1442-9071 (Electronic); 1442-6404 (Linking)

Full metadata record

DC FieldValue Language
dc.contributor.authorCharalampidou, Sofiaen_GB
dc.contributor.authorDooley, Ianen_GB
dc.contributor.authorMolloy, Lauraen_GB
dc.contributor.authorBeatty, Stephenen_GB
dc.date.accessioned2012-02-01T10:52:29Z-
dc.date.available2012-02-01T10:52:29Z-
dc.date.issued2012-02-01T10:52:29Z-
dc.identifier.citationClin Experiment Ophthalmol. 2010 Apr;38(3):255-65.en_GB
dc.identifier.issn1442-9071 (Electronic)en_GB
dc.identifier.issn1442-6404 (Linking)en_GB
dc.identifier.pmid20447121en_GB
dc.identifier.doi10.1111/j.1442-9071.2010.02211.xen_GB
dc.identifier.urihttp://hdl.handle.net/10147/207955-
dc.description.abstractPURPOSE: To report the value of dual biometry in the detection of biometry errors. METHODS: Study 1: retrospective study of 224 consecutive cataract operations. The intraocular lens power calculation was based on immersion biometry. Study 2: immersion biometry was compared with optical coherence biometry (OCB) in terms of axial length, anterior chamber depth, keratometry readings and the recommended lens power to achieve emmetropia. Study 3: prospective study of 61 consecutive cataract operations. Both immersion and OCB were performed, but lens power calculation was based on the latter. RESULTS: Study 1: 115 (86%), 101 (75.4%), 90 (67.2%) and 50 (37.3%) of postoperative spherical equivalents were within +/-1.5 dioptres (D), +/-1.25 D, +/-1 D and +/-0.5 D of the target, respectively. Study 2: excellent agreement between axial length readings, anterior chamber depth readings and keratometry readings by immersion biometry and OCB was observed (reflected in a mean bias of -0.065 mm, -0.048 mm and +0.1803 D, respectively, in association with OCB). Agreement between the lens power recommended by each technique to achieve emmetropia was poor (mean bias of +1.16 D in association with OCB), but improved following appropriate modification of lens constants in the Accutome A-scan software (mean bias with OCB = -0.4 D). Study 3: 37 (92.5%) and 23 (57.5%) of operated eyes achieved a postoperative refraction within +/-1 D and +/-0.5 D of target, respectively. CONCLUSION: Systematic errors in biometry can exist, in the presence of acceptable postoperative refractive results. Dual biometry allows each biometric parameter to be scrutinized in isolation, and identify sources of error that may otherwise go undetected.en_GB
dc.language.isoengen_GB
dc.subject.meshBiometry/methodsen_GB
dc.subject.meshCataract Extraction/*methodsen_GB
dc.subject.meshHumansen_GB
dc.subject.meshIntraoperative Perioden_GB
dc.subject.meshLens Implantation, Intraocular/*statistics & numerical dataen_GB
dc.subject.meshMonitoring, Intraoperativeen_GB
dc.subject.meshPostoperative Perioden_GB
dc.subject.meshPredictive Value of Testsen_GB
dc.subject.meshPreoperative Careen_GB
dc.subject.meshRefraction, Ocular/physiologyen_GB
dc.subject.meshRefractive Errors/*physiopathology/*therapy/ultrasonographyen_GB
dc.subject.meshRetrospective Studiesen_GB
dc.subject.meshTreatment Outcomeen_GB
dc.subject.meshUltrasonography/methodsen_GB
dc.titleValue of dual biometry in the detection and investigation of error in the preoperative prediction of refractive status following cataract surgery.en_GB
dc.contributor.departmentDepartment of Ophthalmology, Waterford Regional Hospital, Waterford, Ireland., sonia.sofia1@gmail.comen_GB
dc.identifier.journalClinical & experimental ophthalmologyen_GB
dc.description.provinceMunster-
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