Nocturnal animals tend to have proportionally bigger eyes than ... kinds of light receptor cells—rods and cones. (Both are named after their relative shapes.) Cones work in bright light and ...

Together, they help your eyes focus so you can clearly see objects at different distances. They also adjust how much light enters your pupil so you can see in dim or bright light. The blood ...

This is because our cone cells function best in relatively bright light. Other cells in our eyes, called rod cells, help us see in dim light. But because rod cells only have a single light-sensitive ...

Anyone who spends hours staring at a computer screen knows how exhausting and uncomfortable eye strain can be. I used to ...

The amount of light entering the eye is controlled by a reflex action. The size of the pupil changes in response to bright or dim light. This is controlled by the muscles of the iris.