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R

Term Definition
Radiographs

X-rays

Retinal damage

The retina is the layer of neurosensory tissue that lines the back, inside wall of the eye. If you imagine that your eye is like a camera, then the retina is the film. When rays of light enter the eye and are focused on the retina by the cornea and lens, the retina reacts. The light receptive nerve cells that comprise the retina generate a nerve impulse whenever they are exposed to light. The retina then sends these nerve impulses along the optic nerve to the brain which interprets them as a picture. It is rather like the film in the camera being developed so that pictures can be viewed. However, just like a picture cannot be developed if the camera has defective film, vision is not possible in an eye with a defective retina.