A swollen cat eye may be due to a variety of infections, including conjunctivitis (also called pinkeye) and keratitis. These infections are usually caused by bacteria or viruses and may cause redness, swelling, pain, watering, or discharge from the eye. If this happens to your cat, take them to the veterinarian immediately to ensure proper treatment.

It may also be caused by irritation from sand, dust, hair or other small particles, causing swelling. If you suspect there is a foreign object in your eye, do not attempt to remove it yourself as this may harm your eye. Instead, take your cat to your veterinarian immediately so they can use the appropriate tools and methods to safely remove the foreign object.