It is true that any surgery on the eye causes changes which may be long lasting. But contrary to the belief only the front most layer of the eye, i.e the Cornea is utilized in Eye transplants. Sometimes the adjacent area which is the white layer – Sclera, can also be harvested

In this era where there is serious paucity of human donors and tissues, every tissue becomes valuable.

So even if you have undergone eye surgery in the past, you can sill donate your eyes.