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BACKGROUND: This study evaluated the impact of antiangiogenetic therapy on differences in central retinal thickness (CRT) as measured with two optical coherence tomography (OCT) systems from the same manufacturer. MATERIAL AND METHODS: Data were obtained from a group of 20 patients with neovascular age-related macular degeneration before and after intravitreal treatment with ranibizumab. Imaging was performed using the Stratus and the high-definition (HD) Cirrus OCT systems. RESULTS: The mean CRT was revealed to be significantly lower as measured by OCT compared with HD-OCT before and after treatment (p<0.002). CRT differences varied more strongly before treatment than after treatment. A higher standard deviation was noted before treatment. The difference in the mean deviation of CRT measurements before and following antiangiogenetic therapy was highly significant. CONCLUSION: This study showed that differences in CRT measurements between different OCT systems were subject not only to technical differences but also to treatment effects of current antiangiogenetic strategies. These effects should be recognized because clinical studies increasingly define OCT parameters as primary or secondary outcome measures.
