simple eye

US /ˈsɪm.pəl ˌaɪ/
UK /ˈsɪm.pəl ˌaɪ/
"simple eye" picture
1.

单眼, 眼点

a small, simple eye found in many invertebrates, typically consisting of a few photoreceptor cells and a lens, capable of detecting light intensity but not forming detailed images

:
Insects often have both compound eyes and simple eyes (ocelli).
昆虫通常既有复眼,也有单眼(眼点)。
The spider's simple eyes are primarily used for detecting changes in light and shadow.
蜘蛛的单眼主要用于检测光线和阴影的变化。