An objective scatter index based on double-pass retinal images of a point source to classify cataracts

Autor: Jose M. Marin, Jaume Pujol, Alvaro De Casas, Pablo Artal, Encarna Alcón, Guillermo M. Pérez, Antonio Benito
Přispěvatelé: Universitat Politècnica de Catalunya. Departament d'Òptica i Optometria, Universitat Politècnica de Catalunya. GREO - Grup de Recerca en Enginyeria Òptica
Jazyk: angličtina
Rok vydání: 2011
Předmět:
Index (economics)
Anatomy and Physiology
Cataracts and Other Lens Disorders
Rank (linear algebra)
genetic structures
Light
Radiography
Visual Acuity
lcsh:Medicine
Double pass
chemistry.chemical_compound
Engineering
Degeneració retinal
Health Status Indicators
Scattering
Radiation
lcsh:Science
Optical Properties
Condensed-Matter Physics
Retinal degeneration
Physics
Aged
80 and over
Multidisciplinary
Cataractes (Oftalmologia)
Medicine
Research Article
Test Evaluation
Adult
Diagnostic Imaging
Point source
Ocular Anatomy
Materials Science
Material Properties
Bioengineering
Cataract Extraction
Models
Biological
Retina
Cataract
Medical Devices
Appointments and Schedules
Young Adult
Cataracts
Ocular System
Diagnostic Medicine
Medical imaging
medicine
Humans
Biology
Aged
business.industry
lcsh:R
Pattern recognition
Retinal
Optics
Ciències de la salut::Medicina::Oftalmologia [Àrees temàtiques de la UPC]
medicine.disease
Ophthalmology
chemistry
Optometry
lcsh:Q
Surgery
Artificial intelligence
business
Zdroj: UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)
Recercat. Dipósit de la Recerca de Catalunya
instname
PLoS ONE
PLoS ONE, Vol 6, Iss 2, p e16823 (2011)
DOI: 10.1371/journal.pone.0016823
Popis: PURPOSE: To propose a new objective scatter index (OSI) based in the analysis of double-pass images of a point source to rank and classify cataract patients. This classification scheme is compared with a current subjective system. METHODS: We selected a population including a group of normal young eyes as control and patients diagnosed with cataract (grades NO2, NO3 and NO4) according to the Lens Opacities Classification System (LOCS III). For each eye, we recorded double-pass retinal images of a point source. In each patient, we determined an objective scatter index (OSI) as the ratio of the intensity at an eccentric location in the image and the central part. This index provides information on the relevant forward scatter affecting vision. Since the double-pass retinal images are affected by both ocular aberrations and intraocular scattering, an analysis was performed to show the ranges of contributions of aberrations to the OSI. RESULTS: We used the OSI values to classify each eye according to the degree of scatter. The young normal eyes of the control group had OSI values below 1, while the OSI for subjects in LOCS grade II were around 1 to 2. The use of the objective index showed some of the weakness of subjective classification schemes. In particular, several subjects initially classified independently as grade NO2 or NO3 had similar OSI values, and in some cases even higher than subjects classified as grade NO4. A new classification scheme based in OSI is proposed. CONCLUSIONS: We introduced an objective index based in the analysis of double-pass retinal images to classify cataract patients. The method is robust and fully based in objective measurements; i.e., not depending on subjective decisions. This procedure could be used in combination with standard current methods to improve cataract patient surgery scheduling.
Databáze: OpenAIRE
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