Retinitis pigmentosa (RP) is a rare, hereditary disease that causes the rod photoreceptors in the retina to gradually degenerate.
The rods are located in the periphery of the retina and are responsible for peripheral and night vision. Cones, another type of photoreceptor, are densely concentrated in the macula. The cones are responsible for central visual acuity and color vision.
The disease may be X-linked (passed from a mother to her son), autosomal recessive (genes required from both parents) or autosomal dominant (gene required from one parent).
Since it is often a sex-linked disease, retinitis pigmentosa affects males more than females.
People with RP usually first notice difficulty seeing in dim lighting and gradually lose peripheral vision. The course of RP varies. For some, the affect on vision may be mild. Others experience a progression of the disease that leads to blindness.
In many cases, RP is diagnosed during childhood when the symptoms begin to become apparent. However, depending on the progression of the disease, it may not be detected until later in life.
Signs and Symptoms
- Difficulty seeing in dim lighting
- Tendency to trip easily or bump into objects when in poor lighting
- Gradual loss of peripheral vision
- Glare sensitivity
- Loss of contrast sensitivity
- Eye fatigue (from straining to see)