Symptoms of retinitis pigmentosa

"The most common first symptom is difficulty in seeing in poor light, for example outdoors at dusk, or in a dimly lit room. A second symptom is reduction of the visual field, in which sight is lost from the sides, or from above and below. This is often referred to as tunnel vision and means that the rod cells, and some of the outer cone cells, have been affected first.
In some RP-related conditions central vision is lost first. The first signs of this are difficulty in reading print or carrying out detailed work. All RP conditions are progressive, but the speed at which deterioration takes place varies from one person to another.
In many types of RP, glare from bright lights is an increasing problem, although some people do not experience this until the more advanced stages."