As the disease progresses and more rod cells breakdown, patients lose their peripheral vision (tunnel vision). Individuals
with RP often experience a ring of vision loss in their periphery, but retain clear central vision. Others report the sensation
of tunnel vision, as though they see the world through a straw. Many patients with retinitis pigmentosa retain a small degree
of central vision throughout their life.
Other forms of RP, sometimes called cone-rod dystrophy, first affect central vision. Patients first experience a loss of central
vision that cannot be corrected with glasses or contact lenses. With the loss of cone cells also comes disturbances in color
perception. As the disease progresses, rod cells degenerate causing night blindness and peripheral vision.
Symptoms of RP are most often recognized in children, adolescents and young adults, with progression of the disease continuing
throughout the individual's life. The pattern and degree of visual loss are variable.
* Vision decreased at night or in reduced light
* Loss of peripheral vision
* Loss of central vision (in advanced cases)