The photorecptors responsible for color vision are the _______________________; of these, there are _______________ different types

the region of the retina in which there are no photoreceptors is called the ____________________; this is also known as the _________

retinene (retinaldehdye) is derived from which vitamin?_________________________

When light enter the retina, it first passes through the_____________________ cell layer, then the _________________ cell layer, before reaching the photoreceptors

The axons of ___________________ cells layer, gather to produce the optic nerve