Several people have noticed this poor male House Finch that is suffering from conjunctivitis. This problem is common in House Finches and sometimes other finches. It's a result of Mycoplasma gallisepticum, a bacteria that causes a respiratory disease. Conjunctivitis is one of the side effects. Sometimes the poor birds go completely blind, but other times they recover. The infection can, and often does, spread to other finches in the flock. The good news is that it appears to be far less common now than 10 to 20 years ago.