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

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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.

Original languageEnglish (US)
Article number248222
Pages (from-to)4501-4515
Number of pages15
JournalBiomedical Optics Express
Issue number11
StatePublished - Oct 21 2015


  • Optical coherence tomography
  • Optical diagnostics for medicine
  • Visual optics, metrology
  • Visual optics, modeling

ASJC Scopus subject areas

  • Biotechnology
  • Atomic and Molecular Physics, and Optics


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