- The physiological "blind spot" in the visual field is caused by the optic disc.
- This is because the optic disc is the point where the optic nerve fibers exit the retina and there are no photoreceptor cells (rods or cones) present in this area.
- As a result, no visual information is detected at this location, creating a natural blind spot in the visual field.

The other options listed do not cause this blind spot:
- The fovea centralis is the area of the retina responsible for sharp central vision, containing a high density of cones for detailed vision.
- The macula lutea surrounds the fovea and is involved in central, color, and detailed vision.
- The retinal pigment epithelium plays a role in nourishing retinal visual cells and is not related to the blind spot.

Thus, the correct answer is the optic disc, where the absence of photoreceptors results in the physiological blind spot.

Reference: Gray's Anatomy, 42nd Edition, Volume 1, Chapter 19/Pages 760-762