An image sensor includes multiple unit pixels defined by a pixel isolation layer on a substrate, at least a pair of photoelectric converters in each of the unit pixels and at least an optical divider on a rear surface of the substrate at each of the unit pixels. The photoelectric converters are separated by at least a converter separator in each of the unit pixels and generate photo electrons in response to an incident light that is incident to an incident point of the respective unit pixel. The optical divider is overlapped with the incident point and divides the incident light into a plurality of split lights having the same amount of light such that each of the photoelectric converters receives the same amount of light from the split lights.