Sick bird in yard

Poor bird! You mentioned the eye was red - finches are prone to getting conjunctivitis (pink eye) which can be deadly to them. It is spread easily between birds at bird feeders, so if you have any feeders, you should take them down for a while and disinfect with bleach - there is some more information here: https://redcreekwildlifecenter.com/finch-eye-disease-avian-conjunctivitis/#:~:text=Avian%20conjunctivitis%20is%20an%20eye,bird%20can%20become%20completely%20blind.