  We have developed a multimodal photoacoustic remote sensing (PARS) microscope
combined with swept source optical coherence tomography for in vivo,
non-contact retinal imaging. Building on the proven strength of multiwavelength
PARS imaging, the system is applied for estimating retinal oxygen saturation in
the rat retina. The capability of the technology is demonstrated by imaging
both microanatomy and the microvasculature of the retina in vivo. To our
knowledge this is the first time a non-contact photoacoustic imaging technique
is employed for in vivo oxygen saturation measurement in the retina.
