貓眼睛在一天當中變化很明顯，早晨的時候是棗核狀的，中午像條線，晚上呈圓形。貓的瞳孔會隨著光線的強弱而發生改變。白天的光線強時貓的瞳孔就會縮小，晚上光線弱時貓會放大瞳孔，讓自己看清東西。每個剛出生的貓眼睛都是藍色的，只有當藍膜褪了，眼睛顏色才會固定下來。
...貓眼睛為何放大或縮小
貓眼睛放大或縮小是由於貓的瞳孔調節眼部接收光源強弱，或貓處於緊張狀態引起的。貓的瞳孔非常有彈性，會隨著光線的強弱而收縮，早上貓的眼睛像棗核，隨著光線逐漸增強，貓會把眼睛眯成一條縫，減少刺激，避免強烈的光線傷害到眼睛。到了晚上，周圍環境光線較弱時，貓為了能看清東西就會放大瞳孔，讓更多的光線進入眼睛，這屬於正常情況，不用擔心。
...貓在看到自己喜歡的東西、對某樣東西感到好奇、進入陌生的環境受到了驚嚇，或感覺到自己受到威脅時就會進入緊張狀態。這時貓的瞳孔就會放大，從而導致眼睛顏色變成全黑的，可以輕輕撫摸貓，安撫它的情緒。
...貓眼睛的變化過程
貓眼睛的顏色會隨著年齡的增長而發生變化。貓在剛出生時眼睛上有一層藍灰色的薄膜，俗稱藍膜，此時眼睛呈藍灰色。
...藍膜要到兩個月左右才慢慢褪去，眼睛才算發育完全，這時就可以給貓適當曬曬太陽了。一般在三月齡時貓的眼睛就會顯現出黃色、綠色、藍色、黃綠色等本來的顏色。
...（此處已添加書籍卡片，請到今日頭條客戶端查看）
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