Open AccessCalculation of crystalline lens power using a modification of the Bennett method
Author(s) -
Víctor Hernández,
Florence Cabot,
Marco Ruggeri,
Carolina De Freitas,
Arthur Ho,
Sonia H. Yoo,
Jean-Marie A. Parel,
Fabrice Manns
Publication year - 2015
Publication title -
biomedical optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.362
H-Index - 86
ISSN - 2156-7085
DOI - 10.1364/boe.6.004501
Subject(s) - lens (geology) , optics , refraction , optical power , power (physics) , refractive error , cornea , subjective refraction , mathematics , physics , visual acuity , laser , quantum mechanics
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.