Iv had this issue for past 6 years and it is getting me to breaking point. Lambs born healthy and well, but partly sighted. Eyes look ok just the outer skin around them is more bare and pink skin. Have 4 like it this year again. First found it when bought a ram and all his lambs were born like it first year. Was told it was ewes or ram so put ram to diffent batch the year after and was same issues. So ram and any bloodlines even close to him were sold and culled. This years ones are bew shearling ewes and mix of older and new rams. Ewes blood tests in last all come back Perfect. Any ideas before I just give up and accept it and just have to deal with them every year