The S-cones make up only 8–12 percent of all cones in the retina and are almost completely absent in the absolute center of ...

When you look at the picture below, do you see straight or curved lines? That's the debate triggered by the viral optical illusion that's now raging on social media. The image is an eight-by-eight ...

UC Berkeley scientists created a new platform called “Oz” that directly controls up to 1,000 photoreceptors in the eye at once, providing new insight into the nature of human sight and vision loss. In ...

A biomedical optics engineer discovered a visual illusion where purple dots appear bluer in peripheral vision. This ...