Cat Conjunctivitis: Causes, Treatment and Prevention

Feline conjunctivitis is one of the most common eye conditions in cats, causing discomfort and potentially serious complications if untreated.

Key Facts

Herpesvirus (FHV-1) causes about 80% of feline conjunctivitis cases
Chlamydophila felis bacteria is the second most common infectious cause
Neonatal conjunctivitis in kittens can cause permanent blindness if untreated
Stress is a major trigger for herpesvirus flares in previously infected cats
Discharge colour helps diagnose: clear suggests viral, yellow-green suggests bacterial
Unilateral conjunctivitis is more likely to have a foreign body or non-infectious cause
Calicivirus also causes conjunctivitis alongside upper respiratory signs

Welfare Considerations

Conjunctivitis causes significant ocular pain and discomfort in cats. Affected cats may rub their eyes constantly, squint painfully, or develop photophobia. Chronic or untreated cases can lead to corneal ulceration, scarring, and permanent vision loss. Cats with herpesvirus may experience recurrent flares throughout their lives, requiring ongoing management to maintain comfort and quality of life.

What You Can Do

Schedule veterinary examination for any eye redness, discharge or squinting
Do not share eye drops between cats - infections spread easily
Ask your vet about L-lysine supplementation for herpesvirus management
Keep vaccinations current - FVRCP vaccine protects against herpesvirus and calicivirus
Minimise stress for cats with recurrent herpesvirus flares
Clean eye discharge gently with warm saline-dampened cotton wool
Keep newly adopted cats isolated until eye health is confirmed