can cats get conjunctivitis
1 Conjunctivitis (pink eye) . 2  An inflammation of the light pink lining around your catâs eye, conjunctivitis can cause one or both of your catâs eyes to look red and swollen, be light-sensitive, and have clear, teary or thick, mucus eye discharge. 3  Corneal disorders. Feline upper respiratory infections. 2  A frequent cause of eye discharge in cats, these can include viruses such as feline calicivirus, a contagious respiratory disease, pneumonitis or rhinotracheitis, bacteria, and protozoa.