Original ArticlesPartial coherence interferometry: a novel approach to biometry in cataract surgery☆
Section snippets
Subjects and methods
The principle of the dual beam version of partial coherence interferometry has been previously described.15, 20, 25 An external Michelson interferometer splits an infrared light beam (λ ≈ 855 nm) of high spatial coherence but very short coherence length into two parts, forming a coaxial dual beam (Figure 1). This dual light beam, containing two beam components1, 2 with a mutual time delay of twice the interferometer arm length difference (2d) introduced by the interferometer, illuminates the
Results
Figure 2 depicts a typical measurement of the anterior segment of a cataract eye. The partial coherence interferometry signal intensity is plotted vs the optical distance to the anterior corneal surface. Four main peaks, arising from light reflected at the anterior and posterior corneal and anterior and posterior lens surfaces can be distinguished, indicating the optical corneal thickness, anterior chamber depth, and lens thickness, respectively. Peaks 1 and 2, within the lens and with lower
Discussion
We have demonstrated that biometry based on partial coherence interferometry has the potential of improving the determination of the refractive power of intraocular lenses and therefore improving refractive outcome in cataract surgery by 27%.
Measurements were attainable in all 85 patients with partial coherence interferometry. Although LOCS III allows only semiquantitative evaluation of cataract stage, preoperative visual acuity correlated significantly with cataract grade when using LOCS III
Acknowledgments
The authors thank Ing H. Sattmann, who constructed the electronics and software of the instrument, and Mr L. Schachinger, who provided technical support, of the Institute of Medical Physics, University of Vienna.
References (53)
- et al.
Comparison of the accuracy of the Binkhorst, Colenbrander, and SRK™ implant power prediction formulas
Am Intra-Ocular Implant Soc J
(1981) - et al.
Comparison of the SRK II™ formula and other second generation formulas
J Cataract Refract Surg
(1988) The Hoffer Q formulaa comparison of theoretic and regression formulas
J Cataract Refract Surg
(1993)Sources of error in intraocular lens power calculation
J Cataract Refract Surg
(1992)- et al.
Ultrasound biomicroscopy of anterior segment tumors
Ophthalmology
(1992) Theoretical approach to intraocular lens calculation using Gaussian optics
J Cataract Refract Surg
(1987)- et al.
Interferometric measurement of corneal thickness with micrometer precision
Am J Ophthalmol
(1994) - et al.
In vivo optical coherence tomography
Am J Ophthalmol
(1993) - et al.
High precision biometry of pseudophakic eyes using partial coherence interferometry
J Cataract Refract Surg
(1998) - et al.
Accurate determination of intraocualar lens position and lens-capsule distance using partial coherence interferometry
J Cataract Refract Surg
(1998)
Biometric investigation of changes in the anterior eye segment during accommodation
Vis Res
Investigation of dispersion effects in ocular media by multiple wavelength partial coherence interferometer
Exp Eye Res
Imaging of macular diseases with optical coherence tomography
Ophthalmology
Biometry on 7500 cataractous eyes
Am J Ophthalmol
Influence of intraocular lenses on ultrasound axial length measurementin vitro and in vivo studies
Am Intra-Ocular Implant Soc J
Axial length following implantation of posterior chamber lenses
J Cataract Refract Surg
Estimation of optical power of the intraocular lens
Vestn Oftalmol
Calculation of the optical power of intraocular lenses
Invest Ophthalmol Vis Sci
The optical design of intraocular lens implants
Ophthalmic Surg
The accuracy of ultrasonic determination of axial length in pseudophakic eyes
Acta Ophthalmol (Copenh)
Diagnostic ultrasound
The accuracy of ultrasonic measurements of the axial length of the eye
Opthalmic Surg
Accuracy of intraocular lens powers calculated from a-scan biometry with the Echo-Oculometer
Ophthalmic Surg
Improving the predictability of intraocular lens power calculations
Arch Ophthalmol
Ophthalmic laser interferometer
Proc SPIE
Eye length measurement by interferometry with partially coherent light
Opt Lett
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Supported by grant P 9781-MED from the Austrian Fonds zur Förderung der wissenschaftlichen Forschung (Dr Hitzenberger).