Fadywahby, welcome to TCS!How to post pic
No not thatI think that "greenish" thing is conjunctivitis in cats. If only you could post photos.
"One of the main causes of green, mucus-like discharge in cat eyes is cat conjunctivitis. Cats with conjunctivitis, commonly known as pink eye, experience redness and irritation in one or both of the eyes. They may also be sensitive to light, according to WebMD."