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Primary absorbance wavelengths of different endogenous contrast agents demonstrating that the study of hemoglobin using photoacoustic ophthalmoscopy is possible due to its predominant optical absorption compared to other elements, such as water and lipids, in the visible spectral range (380–740 nm). Reproduced with permission from Yao and Wang.123 © 2012 by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
