A Clearer View from Fuzzy Images

. Curiously, however, even though layers 1 and 2 contain primarily green-sensitive photoreceptors, the effect 

of chromatic aberration means that incoming green light is only clearly focused on layer 1. This means that 

the second main green-sensitive retinal layer (layer 2) receives a defocused or “fuzzy” image. Nagata et 

al. suggest that the spiders obtain depth cues from the amount of defocus in this layer, which is 

proportional to the distance of the object to the lens.

거리가 떨어진 센서의 흐려짐 정도가 depth를 나타 낸다고 할 수있다.