Generally speaking, there are several reasons. First of all, after the surgery, your eyes, as well as its accessory organs, such as cornea, conjunctiva or even capillaries are very weak. If you rub it right now, you may easily destroy them. Surgeon will put a manmade crystalline lens in your eyes after the cut off the original one, rubbing may displace the lens and causes problems. Secondly, as hands touch a lot of things in one day, it gets many opportunities to contact bacteria. If you rub your eyes with hand, they can be easily infected by bacteria. As your eyes are weak at the time, it is much more risky to get eye disease like pink eyes, corneal ulcer or keratitis than usual. Once you get these diseases, it will also be much harder than usual to cure them as your eyes are is a special situation. Thus, for your eye's sake, do not rub your eyes right now. Even when you are totally recovered and the manmade crystalline lens is fixed in its place, rubbing eye is also not a suggested habit. It is unhealthy.
