Original articleComparison of Corneal Powers Obtained from 4 Different Devices
Section snippets
Methods
Prospectively, 20 normal volunteers were recruited at the Cullen Eye Institute, Department of Ophthalmology, Baylor College of Medicine. Exclusion criteria were: 1) history of prior intraocular and corneal surgery and trauma, 2) corneal and other ocular diseases that could affect outcomes, or 3) contact lens wear. The purpose, risks, discomfort, and steps of the study were explained to each subject, and written informed consent was obtained from all subjects.
Results
The mean age of the 20 subjects was 36 ± 12.5 years (± SD; range, 23 to 62 years). The subjects consisted of 6 males and 14 females. Ten right eyes and 10 left eyes of the 20 subjects underwent 3 measurements with each device.
Discussion
Accurate results from cataract surgery and procedures to correct corneal astigmatism require accurate measurements of corneal power. Norrby and Olsen demonstrated that inaccurate corneal power is a major cause of error in IOL calculations.18, 19 The purpose of this study was to assess the repeatability and comparability of corneal powers obtained from the Galilei, Humphrey Atlas corneal topographer, IOLMaster, and manual keratometer.
In our study, all devices demonstrated excellent
Mariko Shirayama, MD, graduated from faculty of Medicine, Kagawa University, Kagawa, Japan in 2003. She completed her ophthalmology residency at University of Tokyo Hospital. Dr Shirayama is currently the research fellow in Department of Ophthalmology, Baylor College of Medicine, Houston, Texas. Her research interests are cataract and refractive surgery.
References (25)
- et al.
Comparison of the accuracy and reproducibility of the keratometer and EyeSys Corneal Analysis System Model I
J Cataract Refract Surg
(1992) - et al.
Comparison of three keratometry instruments
J Cataract Refract Surg
(1995) - et al.
Comparison of the accuracy of computerized videokeratography and keratometry for use in intraocular lens calculations
J Cataract Refract Surg
(1993) - et al.
Comparison of portable automated keratometry and manual keratometry for IOL calculation
J Cataract Refract Surg
(1997) - et al.
Reproducibility of optical biometry using partial coherence interferometry: intraobserver and interobserver reliability
J Cataract Refract Surg
(2001) - et al.
Comparison of different techniques of anterior chamber depth and keratometric measurements
Am J Ophthalmol
(2007) - et al.
Reliability of the IOLMaster in measuring corneal power changes after photorefractive keratectomy
J Cataract Refract Surg
(2004) - et al.
Optical and ultrasound measurement of axial length and anterior chamber depth for intraocular lens calculation
J Cataract Refract Surg
(2003) - et al.
Effect of pupil dilation on the accuracy of the IOLMaster
J Cataract Refract Surg
(2002) - et al.
Anterior segment biometry with the Pentacam: comprehensive assessment of repeatability of automated measurements
J Cataract Refract Surg
(2008)
Analysis of aggregate surgically induced refractive change, prediction error, and intraocular astigmatism
J Cataract Refract Surg
Sources of error in intraocular lens power calculation
J Cataract Refract Surg
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Mariko Shirayama, MD, graduated from faculty of Medicine, Kagawa University, Kagawa, Japan in 2003. She completed her ophthalmology residency at University of Tokyo Hospital. Dr Shirayama is currently the research fellow in Department of Ophthalmology, Baylor College of Medicine, Houston, Texas. Her research interests are cataract and refractive surgery.