Rods and Cones
Photoreceptor Cells
However, these retinal cells perform different functions making it possible for us to see and to have clear vision during the day and at night.
Let me explain first what function these retinal cells perform. They are: √ Photoreceptor cells. This simply means that they convert light into electrical messages. These messages are sent to the optic nerve which then goes to the brain. √ Named for their shape √ Both are found in the retina
Rod Cells√ Many more rod cells than cone cells are found in the retina - especially outside the macula; rod cells predominate our peripheral vision√ Responsible for night vision. Rods are needed for the perception of light and darkness and adapting to night time vision √ Responsible for sensing motion √ Cannot transmit sharp images √ Not sensitive to color
Cone Cells√ Are concentrated in the macula√ Are the only cells found in the fovea √ Responsible for straight ahead vision √ Responsible for color perception √ Responsible for sharp or detailed vision √ Less sensitive to light than rod cells The cone cells are the photoreceptor cells that are most affected by macular degeneration. The breakdown of the surrounding layers of tissue prevents nutrients and oxygen from getting to these cells and from moving built up waste out of the area ...leading to the degeneration or dying of the cells.
Go from Rods and Cones to Definition of Macular Degeneration
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