Glaucoma can be a concerning issue. Since he has multiple comorbidities, I would recommend eye drop Dorzox - one drop in both eyes, 3 times a day and
Eye drop cmc - 1 drop in both eyes, 3 times a day. With a gap of atleast 5 minutes between both the drops.
This is only for the time being so that his pressure will be under relatively control. He will require a detailed evaluation as soon as the lockdown is over.
Next Steps
Consult an ophthalmologist nearby as soon as the lockdown is over for a few tests.
Health Tips
Glaucoma may be hereditary. So kindly get your own eyes checked and suggest your siblings to also get their eyes checked to confirm that u r not at risk.