The effect of photographic light brightness on cup to disc ratio grading

BMC Ophthalmology

Ta Chen Chang¹  Alana Grajewski¹  Matthew J. McSoley¹  Eldar Rosenfeld² 

[1]Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, 900 NW 17th Street, 33136, Miami, FL, USA

[2]Department of Ophthalmology, Tel Aviv Sourasky Medical Center, Affiliated to the Sackler Faculty of Medicine, Tel Aviv University, 6 Weizmann Street, 64239, Tel Aviv, Israel

关键词: Digital fundus photography;    Photographic Light Brightness;    Glaucoma;    Cup-to-disc ratio;    Quality Control;   

DOI  :  10.1186/s12886-021-02209-6

来源: Springer

【 摘 要 】

BackgroundDigital optic disc photographs are integral to remote telehealth ophthalmology, yet no quality control standards exist for the brightness setting of the images. This study evaluated the relationship between brightness setting and cup/disc ratio (c/d) grading among glaucoma specialists.MethodsOptic disc photographs obtained during routine examinations under anesthesia were collected to construct an image library. For each optic disc, photographs were obtained at 3 light intensity settings: dark, medium, and bright. From the image library, photograph triads (dark, medium and bright) of 50 eyes (50 patients) were used to construct the study set. Nine glaucoma specialists evaluated the c/d of the study set photographs in randomized order. The relationships between the brightness levels and the c/d grading as well as graders’ years in practice and variability were evaluated.ResultsThe c/d were graded as significantly larger in bright photographs when compared to photographs taken at the medium light intensity (0.53 vs 0.48, P < 0.001) as well as those taken at the dark setting (0.47, P < 0.001). In addition, no relationship was found between ophthalmologists’ years in practice and the variability of their c/d grading (P = 0.76).ConclusionImage brightness affects c/d grading of nonstereoscopic disc photographs. The brighter intensity is associated with larger c/d grading. Photograph brightness may be an important factor to consider when evaluating digital disc photographs.

【 授权许可】

CC BY