Abstract:Objective: To classify drusen size in color fundus photographs by using an automated deep learning model and to investigate the association between refractive error and drusen. Methods: This was a casecontrol study. There were 2 055 color fundus photographs and refractive status were obtained from 1 035 participants aged 50 years and older who underwent physical examinations in Ningbo Medical Center, Lihuili Hospital from January 2017 to December 2017. DeepSeeNet, a deep learning mode, was used to detect drusen size from color fundus photographs. Three hundred ninety-two fundus photographs were randomly selected and assessed manually by one retinal specialist. Cohen's kappa was used to evaluate the consistency between the DeepSeeNet and the retinal specialist. The spherical equivalent refraction was calculated as adiopter (D) according to the computer optometry data, and classified as emmetropia (-0.5- +0.5 D), mild myopia (-3.0--0.51 D) or hyperopia (+0.51-+3.0 D), and moderate to severe myopia (<-3.0 D) or hyperopia (>+3.0 D). Statistical analysis was performed using R statistical software, and a logistic regression model was used to analyze the association between refractive error and drusen size. Results: The classification results of the deep learning model were highly consistent with those of the retinal specialist (κ=0.67, P<0.001). After adjustment for confounding factors, the increase in spherical equivalent was associated with an increased risk of large drusen (OR=1.03, 95%CI: 1.01-1.04, P<0.001). Compared with emmetropia, moderate to high myopia was associated with a lower OR of large drusen (OR=0.89, 95%CI: 0.82-0.97); moderate to high hyperopia was associated with a higher OR of large drusen (OR=1.20, 95%CI: 1.03-1.39). Conclusions: Refractive error is associated with the development of drusen. These results indicate that the use of a deep learning model not only enhances the speed and accuracy of clinical diagnosis, but also provides clues for age-related macular disease related scientific research.
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