MMM sounds like fighting males to me, they often go for the eyes unfortunately.
If they are fighting you should know it though just by watching their behaviour. Pretty hard to miss they really beat hell out of each other and even to the death sometimes.
How stripped are the hens, hens often lose feathers on the back of their neck, and unfortunately some hens that are mated more often than others may have bald necks and some back feathers missing.
Did they all come from the same place and were living together before?
If you put males together that were not together before they will fight.
Also social strife and stress will stop them laying. A happy safe hen is a laying hen!!