The light-absorbing component of a photoreceptor may be replaced by a chemically similar synthetic substance .
感光器中的感光成分也许能被一种化学性质类似的合成物质取代。
At the top of the image are the retina 's photoreceptor cells ( in gray ) - the familiar rods and cones that capture photons of light and translate them into electrical signals that the brain can understand .
Photoreceptor size the size of the capture elements on the iphone 's ccd are quite small , leading to light falloff at the edges of the frame as well as incredible susceptibility to ' camera shake ' or ' blur ' .