Calculation of crystalline lens power using a modification of the Bennett method

Victor M Hernandez; Florence Cabot; Marco Ruggeri; Carolina de Freitas; Arthur Ho; Sonia Yoo; Jean-Marie Parel; Fabrice Manns

doi:10.1364/BOE.6.004501

Calculation of crystalline lens power using a modification of the Bennett method

Biomed Opt Express. 2015 Oct 21;6(11):4501-15. doi: 10.1364/BOE.6.004501. eCollection 2015 Nov 1.

Authors

Victor M Hernandez¹, Florence Cabot², Marco Ruggeri³, Carolina de Freitas³, Arthur Ho⁴, Sonia Yoo², Jean-Marie Parel⁵, Fabrice Manns¹

Affiliations

¹ Ophthalmic Biophysics Center and University of Miami Miller School of Medicine, Miami, FL, USA ; Biomedical Optics and Laser Laboratory, Department of Biomedical Engineering, University of Miami College of Engineering, Coral Gables, FL, USA.
² Ophthalmic Biophysics Center and University of Miami Miller School of Medicine, Miami, FL, USA ; Anne Bates Leach Eye Hospital, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, USA.
³ Ophthalmic Biophysics Center and University of Miami Miller School of Medicine, Miami, FL, USA.
⁴ Ophthalmic Biophysics Center and University of Miami Miller School of Medicine, Miami, FL, USA ; Biomedical Optics and Laser Laboratory, Department of Biomedical Engineering, University of Miami College of Engineering, Coral Gables, FL, USA ; Vision Cooperative Research Centre, Sydney, NSW, Australia ; School of Optometry and Vision Science, University of New South Wales, Sydney, NSW, Australia.
⁵ Ophthalmic Biophysics Center and University of Miami Miller School of Medicine, Miami, FL, USA ; Anne Bates Leach Eye Hospital, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, USA ; Vision Cooperative Research Centre, Sydney, NSW, Australia.

Abstract

We present a method for measuring lens power from extended depth OCT biometry, corneal topography, and refraction using an improvement on the Bennett method. A reduced eye model was used to derive a formula for lens power in terms of ocular distances, corneal power, and objective spherical equivalent refraction. An error analysis shows that the formula predicts relaxed lens power with a theoretical accuracy of ± 0.5 D for refractive error ranging from -10 D to + 10 D. The formula was used to calculate lens power in 16 eyes of 8 human subjects. Mean lens power was 24.3 D ± 1.7 D.

Keywords: (170.4500) Optical coherence tomography; (170.4580) Optical diagnostics for medicine; (330.7325) Visual optics, metrology; (330.7326) Visual optics, modeling.

Abstract

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