Visible-light optical coherence tomography (VisOCT) is the latest development of OCT, providing new capabilities in anatomical and functional imaging of biological tissue. It was first reported by Prof. Hao F. Zhang's group at Northwestern University in 2013 in small animals and has been extended for human use since 2015. 

Unlike most commercial and investigational OCTs that use near-infrared light, visOCT relies on visible light illumination. This requires different engineering design considerations but brings unique benefits to both fundamental research and clinical care of leading blinding diseases.