03-01-2012, 07:41 PM
OK, got it, it is because Kaplan book was explaining rods only, which work only on dark or dim light, so when light hits-->lowers PDE-->low signal-->off
The opposite is true for cons, which are responsible for color and day light vision.
That is why we don't see colors in dim light.
Thanks for raising this point Samideb!
The opposite is true for cons, which are responsible for color and day light vision.
That is why we don't see colors in dim light.
Thanks for raising this point Samideb!