About 3 weeks ago I noticed a female house finch at my feeder who had an eye that was all shut and all crusty looking. I thought maybe she had an injury. Last week a second female was seen with crusty looking eye. And it was a different bird because they were both at the feeder at the same time. Yesterday, a male house finch was seen at the feeder with a crusty looking eye. Anyone else seeing anything like this? I live in the Greenville SC area.