Farming with black Angus,calves are about 2 months old and struggling to control the flies around their eyes.

Used a pour on ,on their faces and mixed it with petroleum gel to smear it on their faces.

After a while the eyes started to get wet and go over in a infection and later blindness in the eye.

Vaccinate for pinkeye last 3 years but not good results,think it will be better to control the flies as good as you can