Double-pass technique and compensation-comparison method in eyes with cataract

Juan A Martínez-Roda; Meritxell Vilaseca; Juan C Ondategui; Lorena Almudí; Moafak Asaad; Lorena Mateos-Pena; Montserrat Arjona; Jaume Pujol

doi:10.1016/j.jcrs.2016.08.015

Double-pass technique and compensation-comparison method in eyes with cataract

J Cataract Refract Surg. 2016 Oct;42(10):1461-1469. doi: 10.1016/j.jcrs.2016.08.015.

Authors

Juan A Martínez-Roda¹, Meritxell Vilaseca², Juan C Ondategui², Lorena Almudí², Moafak Asaad², Lorena Mateos-Pena², Montserrat Arjona², Jaume Pujol²

Affiliations

¹ From the University Vision Centre (Martínez-Roda, Ondategui, Mateos-Pena), Department of Optics and Optometry, and the Centre for Sensors, Instruments and Systems Development (Vilaseca, Arjona, Pujol), Universitat Politècnica de Catalunya, and the Ophthalmology Service (Almudí, Asaad), Hospital de Terrassa, Terrassa, Barcelona, Spain. Electronic address: jmartinez@oo.upc.edu.
² From the University Vision Centre (Martínez-Roda, Ondategui, Mateos-Pena), Department of Optics and Optometry, and the Centre for Sensors, Instruments and Systems Development (Vilaseca, Arjona, Pujol), Universitat Politècnica de Catalunya, and the Ophthalmology Service (Almudí, Asaad), Hospital de Terrassa, Terrassa, Barcelona, Spain.

PMID: 27839601
DOI: 10.1016/j.jcrs.2016.08.015

Abstract

Purpose: To clinically assess the objective scatter index (OSI) obtained from double-pass images and the log(s) parameter measured with the direct compensation-comparison psychophysical technique in eyes with cataract.

Setting: Ophthalmology Service, Terrassa Hospital, Barcelona, Spain.

Design: Prospective observational case series.

Methods: The analysis comprised eyes diagnosed with nuclear, cortical, or posterior subcapsular cataracts and healthy eyes (control group). Patient examinations included assessment of the manifest subjective refraction, corrected distance visual acuity, contrast sensitivity, and cataract grade using the Lens Opacities Classification System III (LOCS III) score. The protocol also included the straylight (log[s]) measured by the C-Quant device, measurement of the objective optical quality (Strehl ratio and modulation transfer function cutoff frequency), and the OSI (HD Analyzer).

Results: Significant correlations with LOCS III classification were found in terms of log(s) and OSI, although they were slightly stronger with OSI for all cataract types, which could be attributable to higher-order aberrations. The OSI and log(s) shared approximately 44% of the scattering estimation and to coincide on the visual function decline with scattering for the 3 cataract types evaluated. Limits to discriminate between healthy and cataractous eyes and sensitivity and specificity values were 1.15 (sensitivity 91%, specificity 100%) for log(s) and 1.18 (sensitivity 89%, specificity 100%) for OSI (P < .05).

Conclusions: Both instruments provide complementary information to diagnose cataracts and follow patients. Although backscattered light from deeper retinal layers can have an effect on OSI, the double-pass image provides information to grade different types of cataract when assessing cataractous eyes for treatment.

Financial disclosure: None of the authors has a financial or proprietary interest in any material or method mentioned.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Cataract / diagnosis*
Diagnostic Techniques, Ophthalmological*
Humans
Light
Prospective Studies
Refraction, Ocular
Scattering, Radiation
Spain
Visual Acuity