Redness or puffiness is quite normal after the cryo surgery as the skin is exposed to extreme cold. It might take 10 or 14 days for the swelling to go away on its own.
However, if the swelling, redness or puffiness remains even after a few days, it is advised to connect with your doctor and get the operated eye checked. Though these cases are extremely rare and may only happen if you do not take proper care of your eye after the cryo surgery, it is imperative to be extremely cautious and follow the instructions given by your doctor.