The part of the retina that lacks photoreceptors is called the optic disc, also known as the blind spot.
The optic disc is the point where the optic nerve exits the eye. Since there are no photoreceptors (rods or cones) in this area, it cannot detect light. This means that any images that fall on this spot will not be perceived by the brain, resulting in a small blind spot in our vision. However, our brains compensate for this lack of information, allowing us to perceive a continuous field of vision.