Where is the night blind spot located?

The night blind spot is prominently associated with the fovea centralis, which is the part of the retina responsible for the sharpest vision in bright light due to a high concentration of cone photoreceptors. However, in low-light conditions, such as those when using night vision goggles, the fovea centralis is not as effective because cone cells do not perform well in dark environments. Instead, vision relies more on rod cells, which are more sensitive to light but do not provide the same level of detail as cones. Consequently, the fovea, lacking rod cells, cannot function well in darkness, leading to a "blind spot" in night vision.

This understanding of the fovea centralis elucidates why it is highlighted in questions related to night vision. Other parts of the eye, such as the cornea, optic disk, and iris, do not specifically contribute to the phenomenon of night blindness in the same context, as they have different roles in vision and do not relate to the mechanisms of light sensitivity in the night vision spectrum.