Are some or all of my client’s vision problems due to chronic virus infection?

This is not your imagination. Like many people, she has been exposed to viruses in the past. Her vision is troubled largely by karma but that set her up to have special vulnerability with respect to her eyesight. So the right kind of virus coming along can be expected to find a vulnerable location to establish a foothold and that is what happened, with things proceeding from there over time to cause further damage. Some of the changes will indeed be amenable to improvement working through the LHP, as well as the DSMR, on viral removal, to double the work on the consciousness of the offending pathogens themselves.