Rod Cell

Topics: Retina, Eye, Cone cell Pages: 1 (337 words) Published: December 18, 2012
- The major functions of the cell is concentrated at the outer edges of the retina and are used in peripheral vision. On average, there are about 125 million rod cells in the human retina. Rod cells are almost entirely responsible for night vision. Rod cells do not process fine details or color differences, but are highly sensitive to light. A single flash of light is all that is require to produce a response from a rod cell. Rod cells function as specialized neurons that convert visual stimuli in the form of photons (particles of light) into chemical and electrical stimuli. Rod cells are responsible for perceiving the size, shape, and brightness of visual images. -The rod cell is one of two types of photoreceptive cells in the retina of the eye in vertebrate animals. - The rod cell is processed by the central nervous system which associates it with the brain and the spinal cord because the retina in the eye is transferring stimuli. - Retinitis Pigmentosa is the degeneration of rods and cones. These are the cells which capture and process light helping us to see: the cones with clear central vision and color vision. RP mutates the function of the rod and cone cells and they slowly stop working. This first leads to night-blindness and as the disease progresses and more rod cells degenerate, loss of peripheral vision or tunnel vision occur. Other forms of retinal degeneration first affect cone cells and central vision. Such conditions tend to be named cone-rod dystrophies (CRD). People with CRD first experience a loss of central vision that cannot be corrected with glasses or contact lenses. With the loss of cone cells also come disturbances in color perception. As the disease progresses, rod cells degenerate, causing night blindness and low peripheral vision. Symptoms of retinitis pigmentosa and CRD are most often recognized in children, adolescents and young adults, with progression of the disease continuing throughout their life. The pattern, degree and rate...
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