How do I see in colour?
The retina is packed with a layer of tiny cells called rods and cones. These cells contain coloured substances that react when light fall on them, triggering a nerve impulse. Rods are slim cells that are responsible for black and white vision. They work even in very dim light, seeing everything in shades of grey. Cone cells give us colour vision. They contain different light-sensitive substances that respond to either red, yellow-green or blue-violet light. Together with the grey images produced from the rods, cone cells give you the coloured picture that you see. Cones only work in bright light, which is why colours are difficult to see in dim light. You have 125 million rod cells and 7 million cone cells in each eye.
Do my eyes see upside down?
The image that forms on the retina when light passes through the lens is upside down. This is because of the way in which light rays are bent by the eye’s lens. The brain automatically turns the image the right way up, but you are never aware that this is happening.
Pictures Credit: Google
