In retinal degenerative diseases such as retinitis pigmentosa, cones stop providing vision before they die and can remain in a compromised state for several years. 在视网膜变性疾病,如色素性视网膜炎,视锥体停止提供视力死亡之前,可以在妥协的状态持续数年。
Blood supply of retina posseses both retinal and choroidal components. The choriocapillaris nourishes the outer layers of the retina, including retinal pigment epithelium ( RPE), rods and cones. 脉络膜毛细血管层是视网膜的血供来源之一,供养视网膜外层,即视杆视锥细胞和视网膜色素上皮(RPE)。