Problem:
I've seen a patient who had a Vasectomy (eye surgery) done on a single eye manifest massive swelling on both eyelids.
That seems like having my left hand swell after punching a wall with my right one.
Required:
Question 1: Is this example in the eyes rare?
Question 2: How and why does it happen in the eyes?
Question 3: Does it happen anywhere else?
Please explain all the answers.