Aw, how great that you adopted the kitties!
So the eye and nose drops worked for the other kitty but not for Ramen? How long has this been going on? I assume the vet has tried different kinds of eye and nose drops, so if none of them have been effective, another cause should be investigated. Maybe it's not due to the herpes virus.
If the discharge is only from one of his eyes, I'm not sure it would be allergies, but maybe? Is there anything scented, like sprays, candles, etc. that might be bothering him?
If it is a herpes flare-up, you probably know that stress triggers herpes flare-ups, so keeping his stress low is crucial. Do the two kitties get along?