Cones - GCSE Biology Definition

In GCSE Biology, 'cones' refer to the special cells in your eyes that help you see colours. They are one of two types of photoreceptor cells located in the retina, the back part of your eye. Cones work best in bright light and let you detect a wide range of colours. There are three types of cones, each sensitive to either red, green, or blue light. When light hits these cells, they send signals to your brain, which mixes these colours so you can see millions of different shades. Cones are important because they allow you to enjoy colourful views of the world around you.