Retinitis pigmentosa
In the case of retinitis pigmentosa, there is a narrowing of the peripheral visual field, known as tunnel vision, from the outside to the inside. This progressive narrowing of the tunnel vision usually precedes night blindness and the loss of visual acuity. Other symptoms include an increased sensitivity to glare, as well as problems with contrast and colour vision. At an advanced stage, retinitis pigmentosa can eventually lead to blindness.