Dear missy32666,
Once in a while, the membrane behind the implant will once again obscure vision. It can be opened again with a YAG. If you have had retinal tears, I would recommend that you get it checked again before and after the procedure.
Dr. Feldman
Sandy T. Feldman, M.D., M.S.
ClearView Eye and Laser Medical Center
San Diego, California
Usually a yag capsulotomy is only done once. Rarely the original opening may be enlarged in some select cases if the patient notices the edges of the treatment. If you vision is reduced, it is most likely a different problem so please make sure you are completely evaluated. If you ever did have to have another yag capusulomy (very rare) then, yes, you would need to have a very careful retinal exam before and after to make sure the retina is intact and safe.
MJK MD