So we noticed this when inspecting one of the sheep
And on looking closer :
for comparison , here is the other eye
so he has keratoconjuctivitis. According to this website its prevalent at this time of the year as high winds and driving snow (well, hail where we are)causes trauma to the eye , which gets infected . In people the treatment is regular eye drops and antibiotics put in the eye. The work involved in getting close enough to do that is silly , so its a one-off jab with an antibiotic. And keep an eye (!) on the others as its infectious and they congregate (and argue) round the hay feeder.
And a week later :