Aement of Optic Dic Cupping With Digital Fundu Photograph

Purpoe To determine the agreement between the aement of retinal digital image by uing an overlay tranparency heet and the Heidelberg retinal tomograph (HRT) in determining cup-dik ratio greater than 0.6. Deign Diagnotic tet comparion. Method Computerized topographic and monocopic digital image of the optic dik of 628 people aged 70 to 79 year were aeed. A grader (M.C.) defined the dik margin on HRT image, and the operation oftware computed the area cup-dik ratio. The ame grader alo determined whether the vertical cup-dik ratio on retinal image wa greater than 0.6 by uperimpoing a tranparency overlay heet over the image. Finding of a econd grader (J.G.F.) were ued to etablih reliability meaure. Reult The intragrader reliability for the overlay method and HRT wa almot perfect (intracla correlation coefficient [ICC] = 0.96 and 0.99, repectively), wherea the intergrader reliability wa good (ICC = 0.77 and 0.92, repectively). A perfect agreement wa found on 28 (85%) of 33 eye between the overlay and HRT method in determining cup-dik ratio greater than 0.6. Concluion The overlay tranparency method appear to be a reliable and promiing alternative in determining cup-dik ratio greater than 0.6 in a community creening etting.