Background/aims To evaluate the efficacy of a new automatic computer-aided detection (CAD) system for mass screening of retinal nerve fibre layer (RNFL) defects in a large population using fundus photographs.
Methods Among the fundus photographs of 1200 consecutive subjects who visited a healthcare centre, a total of 2270 photographs appropriate for analysis were tested. The photographs were first reviewed by two expert ophthalmologists for detection of RNFL defects (gold standard manual detection). The images were then analysed using an automatic CAD system for detecting RNFL defects in various cases of glaucomatous and non-glaucomatous optic neuropathy. A free-response receiver operating characteristics curve was generated to evaluate the validity of the CAD system. The results of the automatic detection were compared with those of manual detection, and sensitivity and specificity of the CAD system were calculated.
Results In manual detection of 2270 photographs, 41 RNFL defects from 36 photographs (1.6%) were detected, and no RNFL defects were found in 2234 photographs (98.4%). The sensitivity of the CAD system for detecting RNFL defects was 90.2% (37/41 RNFL defects) and the specificity was 72.5% (1620/2234 photographs with no RNFL defects) at a false-positive rate of 0.36 per image.
Conclusions The new CAD system successfully detected RNFL defects during mass screening of fundus photographs in a large population who visited a healthcare centre. The proposed algorithm can be useful for clinicians in screening RNFL defects in healthcare centres. The false-positive rate is still unsatisfactory, although improved compared with the previous study. Further studies are needed to enhance the speed and specificity of image analysis using the CAD system.
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SBH and HKY contributed equally.
Contributors (1) Substantial contributions to the conception (SBH, HKY and J-MH) or design (SBH, HKY, JEO and KGK) of the work, or the acquisition (SBH, HKY and JEO), analysis (HKY, JEO and KGK) or interpretation (SBH, KGK and J-MH) of data. (2) Drafting the work (SBH, HKY and JEO) or revising it critically (KGK and J-MH) for important intellectual content. (3) Final approval of the version published (SBH, HKY, JEO, KGK and J-MH). (4) Agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved (SBH, HKY, JEO, KGK and J-MH).
Funding This work was supported by grant no 14-2014-041 from the SNUBH Research Fund. The funder partly had a role in study design, data collection and analysis, decision to publish and preparation of the manuscript.
Competing interests None declared.
Ethics approval Institutional Review Board of Seoul National University Bundang Hospital.
Provenance and peer review Not commissioned; externally peer reviewed.