See an object in dim-light condition

woolam3

2006-10-30 7:32 am

I know that Rods are responsible for the vision in dim light condition. However, why we can see some colourful objects under that condition? ( Rods only give us black and white vision)? Is it related to cones?

回答 (1)

Conseco

2006-10-30 9:52 am

✔ 最佳答案

原因黎自rod既敏感光譜

首先睇圖先

圖片參考：http://webvision.med.utah.edu/imageswv/spectra.jpeg

[webvision.med.utah.edu]

可以見到
雖然rod對498nm波長既光最敏感
但rod對由約425至550nm波長既光都有反應
所以如果有件藍色物件反射480nm波長既光到隻眼度
但D光又微弱到cone睇唔到的話
rod都可以俾一個微弱反應
又例如黃色物件反射微弱580nm光出黎
rod都可以俾反應
但係信號冇498nm既光所剌激出黎既信號咁強
所以黑夜中綠色物體感覺上最光
紅藍色物體較暗而且顏色上冇分別

參考: 本人讀視光既

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