BACKGROUND: Recent research on macular disease has prompted investigation into the condition of the intersection of the inner and outer segments (IS/OS) and its relationship with retinal photoreceptor abnormalities. Because the relationship between optical coherence tomography (OCT) images and histopathology is unclear, we compared these in an iodoacetic acid (IAA)-induced model of photoreceptor degeneration in rabbits. METHODS: IAA (20 mg/kg), which is toxic to photoreceptors, was injected into six coloured rabbits. After IAA administration, nine retinas were used for histopathological study: three from rabbits surviving for 1 day and six from rabbits surviving for 4 months. Four healthy rabbit retinas served as controls. OCT images were taken before euthanasia. RESULTS: In the controls, OCT images revealed the IS/OS as a clear, straight line. In rabbits surviving for 1 day, the structure of the photoreceptor IS/OS was destroyed and the IS/OS boundary was not visible. In rabbits surviving for 4 months, the IS was still preserved, but the structure of the OS was destroyed or partially disorganised, and the IS/OS was observed as a wavy, broken line on the OCT images. CONCLUSION: The IS/OS on the OCT images reflected the histopathology of the inner and outer segments in a photoreceptor degeneration model.
BACKGROUND: Recent research on macular disease has prompted investigation into the condition of the intersection of the inner and outer segments (IS/OS) and its relationship with retinal photoreceptor abnormalities. Because the relationship between optical coherence tomography (OCT) images and histopathology is unclear, we compared these in an iodoacetic acid (IAA)-induced model of photoreceptor degeneration in rabbits. METHODS:IAA (20 mg/kg), which is toxic to photoreceptors, was injected into six coloured rabbits. After IAA administration, nine retinas were used for histopathological study: three from rabbits surviving for 1 day and six from rabbits surviving for 4 months. Four healthy rabbit retinas served as controls. OCT images were taken before euthanasia. RESULTS: In the controls, OCT images revealed the IS/OS as a clear, straight line. In rabbits surviving for 1 day, the structure of the photoreceptor IS/OS was destroyed and the IS/OS boundary was not visible. In rabbits surviving for 4 months, the IS was still preserved, but the structure of the OS was destroyed or partially disorganised, and the IS/OS was observed as a wavy, broken line on the OCT images. CONCLUSION: The IS/OS on the OCT images reflected the histopathology of the inner and outer segments in a photoreceptor degeneration model.
Authors: Ferenc B Sallo; Tunde Peto; Catherine Egan; Ute E K Wolf-Schnurrbusch; Traci E Clemons; Mark C Gillies; Daniel Pauleikhoff; Gary S Rubin; Emily Y Chew; Alan C Bird Journal: Invest Ophthalmol Vis Sci Date: 2012-09-14 Impact factor: 4.799
Authors: Ferenc B Sallo; Tunde Peto; Catherine Egan; Ute E K Wolf-Schnurrbusch; Traci E Clemons; Mark C Gillies; Daniel Pauleikhoff; Gary S Rubin; Emily Y Chew; Alan C Bird Journal: Invest Ophthalmol Vis Sci Date: 2012-11-29 Impact factor: 4.799