Cats often rub their glass eyes because it is a natural behavior. Cats have a membrane-like substance in their eyes called eye guano that helps protect their eyes from dust and other debris. When a cat wipes its eyes, it will gently press its front paws on the eyes, and then wipe the eyes with its toes to help remove eye droppings and other debris. This is also a way for cats to keep their eyes clean and healthy.
In addition, cats may also wipe glass eyes to help eliminate eye fatigue or irritation. If your cat rubs its eyes frequently, you can observe whether there are any abnormalities in its eyes, such as redness, swelling or watery eyes. If so, you should take it to the veterinarian.
