The black circle in the center of your eye is your pupil. It changes size thousands of times a day. When you're in dim light, it gets bigger to let more light in. When you're in bright light ...

Light. When there’s too much light, your pupils close a little to protect your vision. To test this, your doctor will shine a bright light in your eyes and watch what your pupils do. If they don ...

It’s a good thing you came in now,” a nurse told me before preparing my right eye for numbing drops, an injection and the ...

Neuroscientists and materials scientists have created contact lenses that enable infrared vision in both humans and mice by ...

Light sensitivity in one eye could occur for many reasons, ranging from minor injuries, dry eye, and migraine to more serious conditions, such as multiple sclerosis. Light sensitivity, or ...

If someone flashes a bright light in your eyes, your pupils do not have enough time to contract, leaving your retinas and their underlying choroids exposed. The flashing light reflects off your ...