Automated qualitative and quantitative assessment of posterior capsule opacification by Automated Quantification of After-Cataract II (AQUA II) system

BMC Ophthalmology

Nino Hirnschall¹  Oliver Findl¹  Martin Kronschläger¹  Wolf Buehl²  Axel Pinz³  Hannes Siegl³  Christoph Feichtenhofer³ 

[1] 0000 0000 8987 0344, grid.413662.4, Department of Ophthalmology, Vienna Institute for Research in Ocular Surgery (VIROS), Hanusch Hospital, Heinrich-Collin Str. 30, Vienna, Austria;0000 0000 9259 8492, grid.22937.3d, Department of Ophthalmology, Medical University of Vienna, Vienna, Austria;0000 0001 2294 748X, grid.410413.3, Institute of Electrical Measurement and Measurement Signal Processing, Graz Technical University, Graz, Austria;

关键词: Automated quantification of after-cataract;    AQUA;    Posterior capsule opacification;    Retroillumination image;   

DOI  :  10.1186/s12886-019-1116-z

来源: publisher

【 摘 要 】

BackgroundThe present study aims to investigate an automated qualitative and quantitative assessment system (Automated Quantification of After-Cataract [AQUA II]) of posterior capsule opacification (PCO) in high-resolution digital retroillumination images and consequently reduce observer bias and increase accuracy of PCO grading.MethodsA data set of 100 eyes with no to severe PCO was analysed. Ten eyes were consecutively photographed twice and ten images were rotated to give a total of 120 images for PCO assessment. Validity was determined by including subjective grading and repeatability was determined by evaluating the 20 additional images. Evaluation of posterior capsular opacification (EPCO), posterior capsule opacity (POCO) and AQUA I methods were included for comparative analysis of the data.ResultsThe system developed proved to classify six types of PCO. Validity was confirmed by a Pearson correlation coefficient of r = 0.95 (EPCO r = 0.93; POCO r = 0.72 and AQUA I r = 0.94). Repeatability was better in AQUA II (95% confidence interval [CI] for mean difference: 0.5 ± 1.2) than in subjective grading (95% CI for mean difference: 0.6 ± 1.7), in EPCO grading (95% CI for mean difference: − 0.2 ± 1.5), in POCO grading (95% CI for mean difference: 1.6 ± 2.7) and in AQUA I (95% CI for mean difference: − 1.1 ± 1.9).ConclusionsAQUA II is a system that for the first time not only objectively quantifies PCO, but also qualitatively assesses PCO in an automated manner with texture classification. AQUA II showed an excellent validity and repeatability.

【 授权许可】

CC BY