What happens when we see? Oftentimes we wonder how we see. When we look at an object, light rays from that object fall on our eyes through the cornea which refracts the light rays to the lens and the lens focuses the rays on the retina in the inner layer of the eye. A small opening called pupil in the anterior part of the eye controls the amount of light rays that enters the eye. The retina contains photosensitive pigments called rods and cones which respond to the light rays. The image of the object appears inverted in the retina and it is transferred in form of impulse to the visual cortex in the occipital lobe of the brain. Then, the object is interpreted as upright image, moving or not moving, large or small size, the particular shape, the colour and other details about the object are seen. Objects in the dark are difficult to see because no light rays are being reflected from such objects.
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