simple eye
US /ˈsɪm.pəl ˌaɪ/
UK /ˈsɪm.pəl ˌaɪ/

1.
ojo simple, ocelo
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
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Insects often have both compound eyes and simple eyes (ocelli).
Los insectos a menudo tienen ojos compuestos y ojos simples (ocelos).
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The spider's simple eyes are primarily used for detecting changes in light and shadow.
Los ojos simples de la araña se utilizan principalmente para detectar cambios en la luz y la sombra.