This is a test of commonsense. Complete the next sentence:

How to diagnose and treat blepharitis in cats
Look for swelling of the eyelids.
When a cat has blepharitis its eyelids will likely swell due to the infection. Look for red and puffy eyelids in one or both of your cat's eyelids.
Because this infection is bacterial, it can move from one eye to both eyes. However, it may just stay in one.