Figure 10From: Modern technologies for retinal scanning and imaging: an introduction for the biomedical engineer Retinal Birefringence Scanning (RBS). A birefringence image of the fovea with the scanning circle (3° of visual angle). The circle can be centered on the fovea during central fixation as in (a), or to the side of the center of the fovea during para-central fixation – as in (b).Back to article page