April 2009
Volume 50, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2009
Cataract Evaluation With an Objective Scattering Index Based on Double-Pass Image Analysis
Author Affiliations & Notes
  • J. Pujol
    CD6-Optica i Optometria, Universitat Politecnica Catalunya, Terrassa, Spain
  • M. Vilaseca
    CD6-Optica i Optometria, Universitat Politecnica Catalunya, Terrassa, Spain
  • A. Salvadó
    Hospital Mútua de Terrassa, Terrassa, Spain
  • M. J. Romero
    Hospital Mútua de Terrassa, Terrassa, Spain
  • G. Pérez
    Laboratorio de Óptica, Universidad de Murcia, Murcia, Spain
  • L. Issolio
    Instituto de Luz, Ambiente y Visión, Universidad Nacional de Tucumán, Tucumán, Argentina
  • P. Artal
    Laboratorio de Óptica, Universidad de Murcia, Murcia, Spain
  • Footnotes
    Commercial Relationships  J. Pujol, None; M. Vilaseca, None; A. Salvadó, None; M.J. Romero, None; G. Pérez, None; L. Issolio, None; P. Artal, None.
  • Footnotes
    Support  "Ministerio de Educación y Ciencia", Spain (grants nº DPI2008-06455-C02-01 and FIS2007-64765) (Spain, "Fundación Séneca", Murcia, Spain (grant 04524/GERM/06), and Visiometrics.
Investigative Ophthalmology & Visual Science April 2009, Vol.50, 6127. doi:https://doi.org/
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    • Get Citation

      J. Pujol, M. Vilaseca, A. Salvadó, M. J. Romero, G. Pérez, L. Issolio, P. Artal; Cataract Evaluation With an Objective Scattering Index Based on Double-Pass Image Analysis. Invest. Ophthalmol. Vis. Sci. 2009;50(13):6127. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To evaluate the amount of intraocular scattering in cataract patients by using the Objective Scatter Index (OSI) provided by a double-pass instrument. We establish a quantitative comparison between this objective evaluation and some subjective procedures commonly employed to evaluate cataracts such as visual acuity (VA) and slit-lamp examination.

Methods: : We selected a group of patients in different levels of cataract development from early stages to mature levels. A control group of young normal eyes was also evaluated with the same procedure. The subjective procedure consists in a preliminary exam of the VA with and without correction (UCVA and BSCVA) and the direct observation of the crystalline lens by the slit-lamp image from which a first gradation of the state of every cataract eye is assessed (from 0 to 4). The analysis by the double-pass instrument (OQAS, Visiometrics SL, Spain) provides an objective quantification of intraocular scattering not affected by the contribution of the ocular aberrations (Alcon et al. ARVO 2007).

Results: : The scatter index (OSI) provided a robust tool to objectively classify cataract patients: OSI<2 for eyes without cataract, 2<OSI<5 for early cataracts and OSI>5 for the mature cataract eyes. In most of the patients, we find a correlation between the value of OSI and the BSCVA and UCVA and the previous classification by the slit-lamp images. However, some noticeable differences suggest the convenience of using an objective parameter to establish the severity of the cataract and its actual impact on the retinal image.

Conclusions: : We evaluated the feasibility of using a scatter parameter OSI as a standard procedure in clinical environments to quantify the severity of cataracts. This objective parameter helps to take a sound decision about the convenience of scheduling the cataract surgery.

Keywords: cataract • imaging/image analysis: clinical • visual acuity 
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