Retinitis pigmentosa is a chronic progressive disease of the eye. In the early stages of Pigmentosa, rods are more severely affected than cones in the eye. As the rods die, people experience night blindness and a progressive loss of the visual field, the area of space that is visible at a given instant without moving the eyes. The loss of rods eventually leads to a breakdown and loss of cones. In the late stages of RP, as cones die, people tend to lose more of the visual field, developing the ìtunnel vision.î They may have difficulty performing essential tasks of daily living such as reading, driving, walking without assistance, or recognizing faces and objects.
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