My beardeds left eye kept shut

My bearded is about 2 months old, for a couple of weeks now he keeps his left eye shut. First I figured retained shed and I was able to remove some from his eye, but he still keeps it shut. It's not red or swollen and there is no yellow discharge. It just looks real dry and sometimes I will notice a little white dot of discharge.
He's housed with another beardie that is the same age, but he's had this problem before she came about a week ago.
The UVB and UVA are good.
No sand, just newspaper and a brick which I put in for him to rub his head on and get some shed off, aiming for him to remove whatever from his eye...

So I've read saline solution to wash his eye out, no tap water since it can cause an infection..
Just looking for some help and opinions
Thank you