noun
single eye; one eye; single lens
General term for a single eye or lens, as opposed to a pair or compound eye. Also used in optical contexts (e.g., 単眼鏡, a monocular).
See also: 単眼鏡
彼は事故で単眼になってしまった。
He lost sight in one eye in an accident.
単眼鏡で遠くの景色を眺める。
I view distant scenery with a monocular.
noun
simple eye; ocellus
Zoological term for a simple eye in arthropods and other invertebrates, distinct from compound eyes (複眼).
See also: 複眼
昆虫の頭部には複眼と単眼がある。
Insects have both compound eyes and simple eyes on their heads.