即视网膜中的视杆视锥细胞层，又称雅各布膜（Jacob's membrane），由两种细胞组成，即视杆细胞和视锥细胞。除视网膜黄斑区外，前者在数量上远较后者为多。

• 本条目来自公有领域：《格雷氏解剖学》第20版（1918）。

The elements composing the Layer of Rods and Cones (Jacob’s membrane) in the retina of the eye are of two kinds, rod cells and cone cells, the former being much more numerous than the latter except in the macula lutea.