The cat's inability to open one eye may be due to eye infection, foreign body irritation, eye disease, etc. Cats' eyes can become inflamed due to microbial infections such as bacteria, viruses, or fungi. This can lead to red, swollen, painful eyes, increased discharge, and the cat's inability to open its eyes.

When a cat cannot open one eye, the owner should stay calm, observe the symptoms closely, and take appropriate measures measures. If there is secretion from the cat's eyes, the owner can gently wipe it with saline or warm water to remove the secretion. But please be careful not to use human eye drops or ointments to avoid irritating your cat’s eyes. If the condition is severe or persists, seek medical attention promptly to ensure your cat’s health.