The doctors have asked if she was sick anytime lately. The only thing we could think of was her getting her hepatitus vaccine, along with the MMR booster, and then a hepatitus booster shot in July. After the July booster shot her daughter developed problems with her vision. Wouldn't expect it to. Not itchy, crusty, etc.
Crusty eyes are usually an infection.
Often it is not clear whether this is viral or bacterial-a culture can help. However, we usually treat with antibiotic eye drops awaiting the culture. My mother had an infected tooth. At the same time she went blind in the eye nearest to the infection. She has seen numerous doctors and had a lot of tests done, but can't find what is wrong.