Report Abuse. The eye catches the light. It has receptors that pick up the information (wavelength and intensity of the light) and send it to the brain. Then the brain takes that information and creates a picture based on it (wavelength determines the color, intensity tells if its brighter or darker).eport Abuse. The eye catches the light. It has receptors that pick up the information (wavelength and intensity of the light) and send it to the brain. Then the brain takes that information and creates a picture based on it (wavelength determines the color, intensity tells if its brighter or darker).