Approximately how large is the night blind spot?

The size of the night blind spot is approximately 5 to 10 degrees. This area refers to the region in a person's field of view where vision is significantly reduced or completely absent during low-light conditions, such as nighttime. It occurs because of the distribution of rod and cone photoreceptors in the retina. Rods, which are responsible for vision in dim light, are not uniformly distributed in the retina, leading to a central area that lacks this sensitivity to light. This central blind spot can impact a person's ability to detect objects or movements in low light, thereby affecting their situational awareness when using night vision goggles. Understanding the dimensions of the night blind spot is crucial for optimizing the use of NVGs and ensuring effective navigation and observation in the dark.