![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Stages_in_the_evolution_of_the_eye.png/640px-Stages_in_the_evolution_of_the_eye.png&w=640&q=50)
眼
From Wikipedia, the free encyclopedia
眼(粵拼:ngaan5),又叫目(粵拼:muk6),係用來睇嘢嘅器官。眼其實係用來偵測光。唔同生物都有唔同嘅測光器官。最簡單嘅眼只可以知道周圍係光定暗,但係已經足夠幫生物根據日夜節奏去改變生體機能。[1]而複雜嘅眼就係生物特化出嚟光學結構,做出將光折射出到唔同位置、聚焦成影像、又或者控制有幾多光入到眼入面。以眼入面嘅感光細胞就會偵測到光,然後轉化做電訊號經神經傳到腦度。呢啲比較複雜嘅眼令到生物可以分到形同色,而百份之九十六嘅動物都有呢啲複雜嘅眼。[2]好多動物同人一樣,雙眼夾埋可以有三維視野。亦有一啲動物,雙眼各有各影像。脊椎動物嘅眼呈圓波形,叫眼球。
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Stages_in_the_evolution_of_the_eye.png/320px-Stages_in_the_evolution_of_the_eye.png)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/7/79/Green_Eye.jpg/640px-Green_Eye.jpg)