1. Excessive discharge or foreign object irritation. The owner should first examine the cat's eyes. If there is a large amount of discharge or a foreign object covering the eye, causing it to be completely blocked, the owner can use saline solution or eye wash to clean away the object and discharge. After cleaning, check the cat's eyes again. The owner can take the cat to a veterinary clinic to get eye drops or ointment. If the cat's condition is severe, do not use medication indiscriminately; seek veterinary care immediately.
2. It could be a viral infection. If a cat is infected with calicivirus or herpesvirus, it may develop eye problems, and these viruses can be carried for life. Once the cat's immune system weakens, corresponding symptoms will appear, so owners must ensure their cats are vaccinated.
3. Caused by internal heat. Insufficient daily water intake, excessive oily or salty food, or food with too many seasonings and additives can cause internal heat in cats. When cats have internal heat, their eyes secrete more fluid, causing the upper and lower eyelids to stick together. 
4. Feline conjunctivitis. Most cases of cats being unable to open their eyes are due to some kind of eye disease, such as conjunctivitis, corneal ulcers, foreign bodies, keratitis, etc. If it's caused by a viral infection, the cat will usually not only be unable to open its eyes, but will also experience other symptoms such as fever, loss of appetite, runny nose, and coughing.
5. Eye injury. It's also possible that the cat accidentally bumped its eye while playing, causing bruising and swelling, making it unable to open its eyes.
6. Ingrown eyelashes. Ingrown eyelashes can prevent cats from opening their eyes. It is recommended that owners take their cats to the vet for treatment as soon as possible.
The cat's eyes are unable to open and a white film appears:
1. Conjunctivitis. If your cat has a white film over its eyes, note that this film covers the eyeball when the cat's eyes are closed. If the film doesn't retract when the cat opens its eyes, causing it to be unable to open them, it indicates possible conjunctivitis. There are several causes of conjunctivitis, such as feline herpesvirus infection (feline rhinotracheitis), which can cause difficulty breathing and nasal discharge. Bacterial infections can also cause tearing and red, swollen eyes.
2. Keratitis. The main causes of keratitis in cats include bacterial infection, viral infection, trauma, and entropion (inward turning of the eyelid). It is recommended that owners take their cats to a veterinary hospital for examination as soon as possible to determine the cause of the keratitis and receive appropriate treatment. Early treatment is best.
