Recent connectomic and neuroanatomical mapping studies successfully quantify and map neuronal populations, circuits, and synaptic connections within processing areas of the visual cortex.
The retrieved papers include multiple connectomic studies (such as whole-brain tracing, volumetric electron microscopy, and large-scale biophysical simulations) that successfully map neuron counts, cell types, and synaptic connection averages in the visual cortex. The evidence fully supports the claim, and no papers refute it.