For retinal diseases such as diabetic retinopathy (DR), which affect a wide area of the fundus, the interior surface at the back of the eye, it is important for clinicians to be able to examine a broad area of the eye in a single shot. A research group at Tokyo Medical and Dental University (TMDU) used blue images from widefield scanning laser ophthalmoscopy (SLO) to identify ischemic retinal areas (i.e., areas with low blood flow) in patients with DR. The group used multicolor, widefield SLO to obtain blue images that covered an extensive area of the eye. 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