USC Michelson; Translational Imaging Center: Optical Coherence Tomography (Credit: USC Dornsife / TIC).

USC Michelson; Translational Imaging Center: Optical Coherence Tomography (Credit: USC Dornsife / TIC).

Optical Coherence Tomography, seen above, is an older imaging test similar to a ultrasound, that uses light waves instead of sound to take cross-section pictures of your retina, allows for the viewing of blood vessels and tissue.