What are the eye meds for?
If they're for something like ERU, yes, I would be very concerned that he didn't get them for a day. Depending on the severity of the disease, that could be enough to cause a flare up.
If it is ERU, a way I can think of to perhaps protect a bit more, without you needing to be there, would be to stick a UV blocking flymask on him. Especially with snow, you want his eyes to be protected anyway!
Fabio - 13 year old Arab/QH gelding
Hazel - 14 year old Angora goat
Atticus - 4 year old LaMancha/Alpine cross goat
Rest peacefully, Lacey.