Estimation of effective lens position using a method independent of preoperative keratometry readings.
AffiliationDepartment of Ophthalmology, Waterford Regional Hospital, Institute of Eye, Surgery, Dublin, Ireland. firstname.lastname@example.org
Aged, 80 and over
*Diagnostic Techniques, Ophthalmological
Lens Implantation, Intraocular
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CitationJ Cataract Refract Surg. 2011 Mar;37(3):506-12.
JournalJournal of cataract and refractive surgery
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.
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