![]() As each cone absorbs its color of light, it produces an electrical signal. Cones respond to light that has passed through the lens and onto the fovea. They come in red, green or blue - the colors that each cone type is best at absorbing. It comes in three different types, and each cone has just one type. Rods and cones each have a different opsin.Ĭones have a pigment-protein pair called photopsin (Foh-TOP-sin). I’ll take a cone, pleaseĮach rod or cone cell at the back of the eye has a stack of discs inside, The discs contain a pigment molecule. This is 70 percent of all the sensory receptors in your entire body - for touch, taste smell, hearing and sight all put together. Each human retina (and you have two, one in each eye) contains 125 million rods and about 6 million cones. The light-sensing cells on the retina are known as photoreceptors. These cells relay signals that move through the optic nerve to the brain. The retina hosts the eyes’ rods and cones. That’s a thin layer of tissue covering the eye’s back wall (inside the sclera). Light bouncing off an object goes into the eye, through the cornea and the oval-white lens, which focuses that light on the retina. In fact, when the eye focuses on something, that’s called foveating (FOH-vee-ayt-ing). ![]() When the eye focuses on an object, it directs the light bouncing off the object directly onto the fovea to get the best image. This densely packed set of cells gives us the clearest picture of our world. They are especially concentrated in an area called the fovea (FOH-vee-ah). The tissue there, known as the retina, contains millions of light-sensitive cells. This lens focuses the light, sending it through the liquid-filled globe of the eyeball to the back interior wall of the eye. Light passes right through the cornea and into a transparent, flexible tissue called the lens. This protects the delicate inner eye from everything the world might throw at it. It takes many cells - and finally the brain - to make sense of it all.Īs light enters our eyes, it first heads through a tough outer tissue called the cornea. ![]() How do your eyes work? It’s far more than just forming a tiny picture in your eye.
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