simple eye
US /ˈsɪm.pəl ˌaɪ/
UK /ˈsɪm.pəl ˌaɪ/
1.
単眼, 個眼
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).
昆虫はしばしば複眼と単眼（個眼）の両方を持っています。
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The spider's simple eyes are primarily used for detecting changes in light and shadow.
クモの単眼は主に光と影の変化を検出するために使用されます。