Consumption can be fatal, or recovery can occur with permanent neurologic and ophthalmologic deficits. While the visual loss is not very common, increased intracranial pressure can cause bilateral optic disc swelling from cerebral edema.
The passage describes the potential consequences of consumption, including its ability to be fatal or lead to permanent neurological and ophthalmologic issues. It also explains that while vision loss is uncommon, increased intracranial pressure can cause bilateral optic disc swelling as a result of brain swelling (cerebral edema).