Russian Blue Cat

　　When dust in the air irritates a cat’s eyes, it will tear up. If it is just tearing and both eyes tear simultaneously, it may be harmless. If only one eye begins to tear, or tearing starts gradually, or there are changes in the eye and surrounding area (redness, swelling), it indicates an eye disease requiring medical treatment. If the cat blinks abnormally or squints, it means its eyes are uncomfortable and should see a doctor immediately. Carefully observe the cat’s tearing symptoms to help the veterinarian make an accurate diagnosis. (Source：PetsZone)