Not all eye surgeries require the use of sutures. LASIK, PRK, and most cataract surgery do not require any sutures. Sutures placed at the time of complex cataract surgery, DMEK, or DSAEK are generally removed between 1 week and 1 month after surgery, although dissolving sutures are occasionally used and may not need to be removed. Sutures placed for full thickness transplant (PK) or deep anterior lamellar keratoplasty (DALK) are removed between 3 months and 2 years after surgery depending on the signs of healing and the amount of astigmatism in the cornea.