What will be funduscopically visualized in cases of focal pigmentary atrophy in dry AMD?

In cases of focal pigmentary atrophy in dry age-related macular degeneration (AMD), the correct visualization through fundus examination would be the choroid. This is because focal pigmentary atrophy indicates a loss of retinal pigment epithelium (RPE) and associated photoreceptors, leading to the exposure of the underlying choroidal tissue.

When this atrophy occurs, it creates areas where the normally obscured choroidal structures become more visible. These regions appear as well-defined, atrophic areas with a change in pigment, thereby allowing the choroidal vessels and tissue to be seen more clearly during a fundoscopic examination. The appearance of the choroid helps in assessing the severity and progression of dry AMD, particularly when looking for areas of photoreceptor loss or damage that may warrant monitoring or treatment.

The other options, like retinal blood vessels, the underdeveloped macula, and the optic nerve head, do not represent the specific changes associated with focal pigmentary atrophy in this context, as they do not directly indicate the changes resulting from the atrophy of the RPE and photoreceptors due to AMD.