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Schematic illustration of gold nanoparticles functioning as OCT and PAI contrast agents in the eye. Gold nanoparticles can be administrated to both anterior and posterior chambers and tissues of the eye. When stimulated with incident light, the gold nanoparticles can produce back-scattered light signal which can be detected by OCT camera and form OCT images or ultrasound signal which can be detected by a PAI transducer and form PAI images.
